Derpstances. Everything renamed. Launching does not yet work.

33 files changed, 918 insertions, 457 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b276cf8..43de626b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -297,8 +297,8 @@ gui/dialogs/IconPickerDialog.h
 gui/dialogs/IconPickerDialog.cpp
 gui/dialogs/LegacyModEditDialog.h
 gui/dialogs/LegacyModEditDialog.cpp
-gui/dialogs/OneSixModEditDialog.h
-gui/dialogs/OneSixModEditDialog.cpp
+gui/dialogs/DerpModEditDialog.h
+gui/dialogs/DerpModEditDialog.cpp
 gui/dialogs/ModEditDialogCommon.h
 gui/dialogs/ModEditDialogCommon.cpp
 gui/dialogs/EditNotesDialog.h
@@ -405,32 +405,34 @@ logic/LegacyUpdate.cpp
 logic/LegacyForge.h
 logic/LegacyForge.cpp
 
-# 1.6 instances
-logic/OneSixInstance.h
-logic/OneSixInstance.cpp
-logic/OneSixInstance_p.h
-logic/OneSixUpdate.h
-logic/OneSixUpdate.cpp
-logic/OneSixVersion.h
-logic/OneSixVersion.cpp
-logic/OneSixLibrary.h
-logic/OneSixLibrary.cpp
-logic/OneSixRule.h
-logic/OneSixRule.cpp
+# Derp instances
+logic/DerpUpdate.h
+logic/DerpUpdate.cpp
+logic/DerpVersion.h
+logic/DerpVersion.cpp
+logic/DerpLibrary.h
+logic/DerpLibrary.cpp
+logic/DerpRule.h
+logic/DerpRule.cpp
 logic/OpSys.h
 logic/OpSys.cpp
 logic/ForgeInstaller.h
 logic/ForgeInstaller.cpp
 logic/LiteLoaderInstaller.h
 logic/LiteLoaderInstaller.cpp
+logic/DerpInstance.h
+logic/DerpInstance.cpp
+logic/DerpInstance_p.h
+logic/DerpVersionBuilder.h
+logic/DerpVersionBuilder.cpp
 
 # Nostalgia
 logic/NostalgiaInstance.h
 logic/NostalgiaInstance.cpp
 
 # FTB
-logic/OneSixFTBInstance.h
-logic/OneSixFTBInstance.cpp
+logic/DerpFTBInstance.h
+logic/DerpFTBInstance.cpp
 logic/LegacyFTBInstance.h
 logic/LegacyFTBInstance.cpp
 
@@ -506,7 +508,7 @@ gui/dialogs/InstanceSettings.ui
 gui/dialogs/ProgressDialog.ui
 gui/dialogs/IconPickerDialog.ui
 gui/dialogs/LegacyModEditDialog.ui
-gui/dialogs/OneSixModEditDialog.ui
+gui/dialogs/DerpModEditDialog.ui
 gui/dialogs/EditNotesDialog.ui
 gui/dialogs/AccountListDialog.ui
 gui/dialogs/AccountSelectDialog.ui
diff --git a/gui/MainWindow.cpp b/gui/MainWindow.cpp
index ee9c3fad..ba394a94 100644
--- a/gui/MainWindow.cpp
+++ b/gui/MainWindow.cpp
@@ -84,7 +84,7 @@
 #include "logic/BaseInstance.h"
 #include "logic/InstanceFactory.h"
 #include "logic/MinecraftProcess.h"
-#include "logic/OneSixUpdate.h"
+#include "logic/DerpUpdate.h"
 #include "logic/JavaUtils.h"
 #include "logic/NagUtils.h"
 #include "logic/SkinUtils.h"
@@ -1257,7 +1257,7 @@ void MainWindow::on_actionChangeInstMCVersion_triggered()
 
 	VersionSelectDialog vselect(m_selectedInstance->versionList().get(),
 								tr("Change Minecraft version"), this);
-	vselect.setFilter(1, "OneSix");
+	vselect.setFilter(1, "Derp");
 	if(!vselect.exec() || !vselect.selectedVersion())
 		return;
 
diff --git a/gui/dialogs/OneSixModEditDialog.cpp b/gui/dialogs/DerpModEditDialog.cpp
index 3982f17d..be17404c 100644
--- a/gui/dialogs/OneSixModEditDialog.cpp
+++ b/gui/dialogs/DerpModEditDialog.cpp
@@ -23,9 +23,9 @@
 #include <QKeyEvent>
 #include <QDesktopServices>
 
-#include "OneSixModEditDialog.h"
+#include "DerpModEditDialog.h"
 #include "ModEditDialogCommon.h"
-#include "ui_OneSixModEditDialog.h"
+#include "ui_DerpModEditDialog.h"
 
 #include "gui/Platform.h"
 #include "gui/dialogs/CustomMessageBox.h"
@@ -34,14 +34,14 @@
 #include "gui/dialogs/ProgressDialog.h"
 
 #include "logic/ModList.h"
-#include "logic/OneSixVersion.h"
+#include "logic/DerpVersion.h"
 #include "logic/EnabledItemFilter.h"
 #include "logic/lists/ForgeVersionList.h"
 #include "logic/ForgeInstaller.h"
 #include "logic/LiteLoaderInstaller.h"
 
-OneSixModEditDialog::OneSixModEditDialog(OneSixInstance *inst, QWidget *parent)
-	: QDialog(parent), ui(new Ui::OneSixModEditDialog), m_inst(inst)
+DerpModEditDialog::DerpModEditDialog(DerpInstance *inst, QWidget *parent)
+	: QDialog(parent), ui(new Ui::DerpModEditDialog), m_inst(inst)
 {
 	MultiMCPlatform::fixWM_CLASS(this);
 	ui->setupUi(this);
@@ -81,64 +81,35 @@ OneSixModEditDialog::OneSixModEditDialog(OneSixInstance *inst, QWidget *parent)
 		ui->resPackTreeView->installEventFilter(this);
 		m_resourcepacks->startWatching();
 	}
+
+	connect(m_inst, &DerpInstance::versionReloaded, this, &DerpModEditDialog::updateVersionControls);
 }
 
-OneSixModEditDialog::~OneSixModEditDialog()
+DerpModEditDialog::~DerpModEditDialog()
 {
 	m_mods->stopWatching();
 	m_resourcepacks->stopWatching();
 	delete ui;
 }
 
-void OneSixModEditDialog::updateVersionControls()
+void DerpModEditDialog::updateVersionControls()
 {
 	bool customVersion = m_inst->versionIsCustom();
-	ui->customizeBtn->setEnabled(!customVersion);
-	ui->revertBtn->setEnabled(customVersion);
 	ui->forgeBtn->setEnabled(true);
 	ui->liteloaderBtn->setEnabled(LiteLoaderInstaller(m_inst->intendedVersionId()).canApply());
 	ui->customEditorBtn->setEnabled(customVersion);
 }
 
-void OneSixModEditDialog::disableVersionControls()
+void DerpModEditDialog::disableVersionControls()
 {
-	ui->customizeBtn->setEnabled(false);
-	ui->revertBtn->setEnabled(false);
 	ui->forgeBtn->setEnabled(false);
 	ui->liteloaderBtn->setEnabled(false);
 	ui->customEditorBtn->setEnabled(false);
 }
 
-void OneSixModEditDialog::on_customizeBtn_clicked()
-{
-	if (m_inst->customizeVersion())
-	{
-		m_version = m_inst->getFullVersion();
-		main_model->setSourceModel(m_version.get());
-		updateVersionControls();
-	}
-}
-
-void OneSixModEditDialog::on_revertBtn_clicked()
-{
-	auto response = CustomMessageBox::selectable(
-		this, tr("Revert?"), tr("Do you want to revert the "
-								"version of this instance to its original configuration?"),
-		QMessageBox::Question, QMessageBox::Yes | QMessageBox::No)->exec();
-	if (response == QMessageBox::Yes)
-	{
-		if (m_inst->revertCustomVersion())
-		{
-			m_version = m_inst->getFullVersion();
-			main_model->setSourceModel(m_version.get());
-			updateVersionControls();
-		}
-	}
-}
-
-void OneSixModEditDialog::on_customEditorBtn_clicked()
+void DerpModEditDialog::on_customEditorBtn_clicked()
 {
-	if (m_inst->versionIsCustom())
+	if (QDir(m_inst->instanceRoot()).exists("custom.json"))
 	{
 		if (!MMC->openJsonEditor(m_inst->instanceRoot() + "/custom.json"))
 		{
@@ -147,40 +118,12 @@ void OneSixModEditDialog::on_customEditorBtn_clicked()
 	}
 }
 
-void OneSixModEditDialog::on_forgeBtn_clicked()
+void DerpModEditDialog::on_forgeBtn_clicked()
 {
 	VersionSelectDialog vselect(MMC->forgelist().get(), tr("Select Forge version"), this);
 	vselect.setFilter(1, m_inst->currentVersionId());
 	if (vselect.exec() && vselect.selectedVersion())
 	{
-		if (m_inst->versionIsCustom())
-		{
-			auto reply = QMessageBox::question(
-				this, tr("Revert?"),
-				tr("This will revert any "
-				   "changes you did to the version up to this point. Is that "
-				   "OK?"),
-				QMessageBox::Yes | QMessageBox::No);
-			if (reply == QMessageBox::Yes)
-			{
-				m_inst->revertCustomVersion();
-				m_inst->customizeVersion();
-				{
-					m_version = m_inst->getFullVersion();
-					main_model->setSourceModel(m_version.get());
-					updateVersionControls();
-				}
-			}
-			else
-				return;
-		}
-		else
-		{
-			m_inst->customizeVersion();
-			m_version = m_inst->getFullVersion();
-			main_model->setSourceModel(m_version.get());
-			updateVersionControls();
-		}
 		ForgeVersionPtr forgeVersion =
 			std::dynamic_pointer_cast<ForgeVersion>(vselect.selectedVersion());
 		if (!forgeVersion)
@@ -220,7 +163,7 @@ void OneSixModEditDialog::on_forgeBtn_clicked()
 	}
 }
 
-void OneSixModEditDialog::on_liteloaderBtn_clicked()
+void DerpModEditDialog::on_liteloaderBtn_clicked()
 {
 	LiteLoaderInstaller liteloader(m_inst->intendedVersionId());
 	if (!liteloader.canApply())
@@ -231,13 +174,6 @@ void OneSixModEditDialog::on_liteloaderBtn_clicked()
 			   "into this version of Minecraft"));
 		return;
 	}
-	if (!m_inst->versionIsCustom())
-	{
-		m_inst->customizeVersion();
-		m_version = m_inst->getFullVersion();
-		main_model->setSourceModel(m_version.get());
-		updateVersionControls();
-	}
 	if (!liteloader.apply(m_version))
 	{
 		QMessageBox::critical(
@@ -246,7 +182,7 @@ void OneSixModEditDialog::on_liteloaderBtn_clicked()
 	}
 }
 
-bool OneSixModEditDialog::loaderListFilter(QKeyEvent *keyEvent)
+bool DerpModEditDialog::loaderListFilter(QKeyEvent *keyEvent)
 {
 	switch (keyEvent->key())
 	{
@@ -262,7 +198,7 @@ bool OneSixModEditDialog::loaderListFilter(QKeyEvent *keyEvent)
 	return QDialog::eventFilter(ui->loaderModTreeView, keyEvent);
 }
 
-bool OneSixModEditDialog::resourcePackListFilter(QKeyEvent *keyEvent)
+bool DerpModEditDialog::resourcePackListFilter(QKeyEvent *keyEvent)
 {
 	switch (keyEvent->key())
 	{
@@ -278,7 +214,7 @@ bool OneSixModEditDialog::resourcePackListFilter(QKeyEvent *keyEvent)
 	return QDialog::eventFilter(ui->resPackTreeView, keyEvent);
 }
 
-bool OneSixModEditDialog::eventFilter(QObject *obj, QEvent *ev)
+bool DerpModEditDialog::eventFilter(QObject *obj, QEvent *ev)
 {
 	if (ev->type() != QEvent::KeyPress)
 	{
@@ -292,12 +228,12 @@ bool OneSixModEditDialog::eventFilter(QObject *obj, QEvent *ev)
 	return QDialog::eventFilter(obj, ev);
 }
 
-void OneSixModEditDialog::on_buttonBox_rejected()
+void DerpModEditDialog::on_buttonBox_rejected()
 {
 	close();
 }
 
-void OneSixModEditDialog::on_addModBtn_clicked()
+void DerpModEditDialog::on_addModBtn_clicked()
 {
 	QStringList fileNames = QFileDialog::getOpenFileNames(
 		this, QApplication::translate("LegacyModEditDialog", "Select Loader Mods"));
@@ -308,7 +244,7 @@ void OneSixModEditDialog::on_addModBtn_clicked()
 		m_mods->startWatching();
 	}
 }
-void OneSixModEditDialog::on_rmModBtn_clicked()
+void DerpModEditDialog::on_rmModBtn_clicked()
 {
 	int first, last;
 	auto list = ui->loaderModTreeView->selectionModel()->selectedRows();
@@ -319,12 +255,12 @@ void OneSixModEditDialog::on_rmModBtn_clicked()
 	m_mods->deleteMods(first, last);
 	m_mods->startWatching();
 }
-void OneSixModEditDialog::on_viewModBtn_clicked()
+void DerpModEditDialog::on_viewModBtn_clicked()
 {
 	openDirInDefaultProgram(m_inst->loaderModsDir(), true);
 }
 
-void OneSixModEditDialog::on_addResPackBtn_clicked()
+void DerpModEditDialog::on_addResPackBtn_clicked()
 {
 	QStringList fileNames = QFileDialog::getOpenFileNames(
 		this, QApplication::translate("LegacyModEditDialog", "Select Resource Packs"));
@@ -335,7 +271,7 @@ void OneSixModEditDialog::on_addResPackBtn_clicked()
 		m_resourcepacks->startWatching();
 	}
 }
-void OneSixModEditDialog::on_rmResPackBtn_clicked()
+void DerpModEditDialog::on_rmResPackBtn_clicked()
 {
 	int first, last;
 	auto list = ui->resPackTreeView->selectionModel()->selectedRows();
@@ -346,12 +282,12 @@ void OneSixModEditDialog::on_rmResPackBtn_clicked()
 	m_resourcepacks->deleteMods(first, last);
 	m_resourcepacks->startWatching();
 }
-void OneSixModEditDialog::on_viewResPackBtn_clicked()
+void DerpModEditDialog::on_viewResPackBtn_clicked()
 {
 	openDirInDefaultProgram(m_inst->resourcePacksDir(), true);
 }
 
-void OneSixModEditDialog::loaderCurrent(QModelIndex current, QModelIndex previous)
+void DerpModEditDialog::loaderCurrent(QModelIndex current, QModelIndex previous)
 {
 	if (!current.isValid())
 	{
diff --git a/gui/dialogs/OneSixModEditDialog.h b/gui/dialogs/DerpModEditDialog.h
index 2510c59c..e9e61c65 100644
--- a/gui/dialogs/OneSixModEditDialog.h
+++ b/gui/dialogs/DerpModEditDialog.h
@@ -16,21 +16,21 @@
 #pragma once
 #include <QDialog>
 
-#include <logic/OneSixInstance.h>
+#include <logic/DerpInstance.h>
 
 class EnabledItemFilter;
 namespace Ui
 {
-class OneSixModEditDialog;
+class DerpModEditDialog;
 }
 
-class OneSixModEditDialog : public QDialog
+class DerpModEditDialog : public QDialog
 {
 	Q_OBJECT
 
 public:
-	explicit OneSixModEditDialog(OneSixInstance *inst, QWidget *parent = 0);
-	virtual ~OneSixModEditDialog();
+	explicit DerpModEditDialog(DerpInstance *inst, QWidget *parent = 0);
+	virtual ~DerpModEditDialog();
 
 private
 slots:
@@ -45,8 +45,6 @@ slots:
 	void on_buttonBox_rejected();
 	void on_forgeBtn_clicked();
 	void on_liteloaderBtn_clicked();
-	void on_customizeBtn_clicked();
-	void on_revertBtn_clicked();
 	void on_customEditorBtn_clicked();
 	void updateVersionControls();
 	void disableVersionControls();
@@ -57,12 +55,12 @@ protected:
 	bool resourcePackListFilter(QKeyEvent *ev);
 
 private:
-	Ui::OneSixModEditDialog *ui;
-	std::shared_ptr<OneSixVersion> m_version;
+	Ui::DerpModEditDialog *ui;
+	std::shared_ptr<DerpVersion> m_version;
 	std::shared_ptr<ModList> m_mods;
 	std::shared_ptr<ModList> m_resourcepacks;
 	EnabledItemFilter *main_model;
-	OneSixInstance *m_inst;
+	DerpInstance *m_inst;
 public
 slots:
 	void loaderCurrent(QModelIndex current, QModelIndex previous);
diff --git a/gui/dialogs/OneSixModEditDialog.ui b/gui/dialogs/DerpModEditDialog.ui
index 899e0cbf..7aaf1564 100644
--- a/gui/dialogs/OneSixModEditDialog.ui
+++ b/gui/dialogs/DerpModEditDialog.ui
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>OneSixModEditDialog</class>
- <widget class="QDialog" name="OneSixModEditDialog">
+ <class>DerpModEditDialog</class>
+ <widget class="QDialog" name="DerpModEditDialog">
   <property name="geometry">
    <rect>
     <x>0</x>
@@ -85,29 +85,6 @@
           </widget>
          </item>
          <item>
-          <widget class="QPushButton" name="customizeBtn">
-           <property name="toolTip">
-            <string>Create an customized copy of the base version</string>
-           </property>
-           <property name="text">
-            <string>Customize</string>
-           </property>
-          </widget>
-         </item>
-         <item>
-          <widget class="QPushButton" name="revertBtn">
-           <property name="enabled">
-            <bool>false</bool>
-           </property>
-           <property name="toolTip">
-            <string>Revert to original base version</string>
-           </property>
-           <property name="text">
-            <string>Revert</string>
-           </property>
-          </widget>
-         </item>
-         <item>
           <widget class="Line" name="line">
            <property name="frameShadow">
             <enum>QFrame::Sunken</enum>
diff --git a/logic/BaseInstance.h b/logic/BaseInstance.h
index a861e9b2..79640c84 100644
--- a/logic/BaseInstance.h
+++ b/logic/BaseInstance.h
@@ -27,7 +27,7 @@
 class QDialog;
 class Task;
 class MinecraftProcess;
-class OneSixUpdate;
+class DerpUpdate;
 class InstanceList;
 class BaseInstancePrivate;
 
diff --git a/logic/OneSixFTBInstance.cpp b/logic/DerpFTBInstance.cpp
index e50a5b53..f9aeeca0 100644
--- a/logic/OneSixFTBInstance.cpp
+++ b/logic/DerpFTBInstance.cpp
@@ -1,17 +1,17 @@
-#include "OneSixFTBInstance.h"
+#include "DerpFTBInstance.h"
 
-#include "OneSixVersion.h"
-#include "OneSixLibrary.h"
+#include "DerpVersion.h"
+#include "DerpLibrary.h"
 #include "tasks/SequentialTask.h"
 #include "ForgeInstaller.h"
 #include "lists/ForgeVersionList.h"
 #include "MultiMC.h"
 
-class OneSixFTBInstanceForge : public Task
+class DerpFTBInstanceForge : public Task
 {
 	Q_OBJECT
 public:
-	explicit OneSixFTBInstanceForge(const QString &version, OneSixFTBInstance *inst, QObject *parent = 0) :
+	explicit DerpFTBInstanceForge(const QString &version, DerpFTBInstance *inst, QObject *parent = 0) :
 		Task(parent), instance(inst), version("Forge " + version)
 	{
 	}
@@ -38,7 +38,7 @@ public:
 			fjob = new NetJob("Forge download");
 			fjob->addNetAction(CacheDownload::make(forgeVersion->installer_url, entry));
 			connect(fjob, &NetJob::failed, [this](){emitFailed(m_failReason);});
-			connect(fjob, &NetJob::succeeded, this, &OneSixFTBInstanceForge::installForge);
+			connect(fjob, &NetJob::succeeded, this, &DerpFTBInstanceForge::installForge);
 			connect(fjob, &NetJob::progress, [this](qint64 c, qint64 total){ setProgress(100 * c / total); });
 			fjob->start();
 		}
@@ -60,8 +60,6 @@ slots:
 			emitFailed(tr("Couldn't load the version config"));
 			return;
 		}
-		instance->revertCustomVersion();
-		instance->customizeVersion();
 		auto version = instance->getFullVersion();
 		if (!forge.apply(version))
 		{
@@ -72,41 +70,41 @@ slots:
 	}
 
 private:
-	OneSixFTBInstance *instance;
+	DerpFTBInstance *instance;
 	QString version;
 	ForgeVersionPtr forgeVersion;
 	MetaEntryPtr entry;
 	NetJob *fjob;
 };
 
-OneSixFTBInstance::OneSixFTBInstance(const QString &rootDir, SettingsObject *settings, QObject *parent) :
-	OneSixInstance(rootDir, settings, parent)
+DerpFTBInstance::DerpFTBInstance(const QString &rootDir, SettingsObject *settings, QObject *parent) :
+	DerpInstance(rootDir, settings, parent)
 {
 	QFile f(QDir(minecraftRoot()).absoluteFilePath("pack.json"));
 	if (f.open(QFile::ReadOnly))
 	{
 		QString data = QString::fromUtf8(f.readAll());
 		QRegularExpressionMatch match = QRegularExpression("net.minecraftforge:minecraftforge:[\\.\\d]*").match(data);
-		m_forge.reset(new OneSixLibrary(match.captured()));
+		m_forge.reset(new DerpLibrary(match.captured()));
 		m_forge->finalize();
 	}
 }
 
-QString OneSixFTBInstance::id() const
+QString DerpFTBInstance::id() const
 {
 	return "FTB/" + BaseInstance::id();
 }
 
-QString OneSixFTBInstance::getStatusbarDescription()
+QString DerpFTBInstance::getStatusbarDescription()
 {
-	return "OneSix FTB: " + intendedVersionId();
+	return "Derp FTB: " + intendedVersionId();
 }
-bool OneSixFTBInstance::menuActionEnabled(QString action_name) const
+bool DerpFTBInstance::menuActionEnabled(QString action_name) const
 {
 	return false;
 }
 
-std::shared_ptr<Task> OneSixFTBInstance::doUpdate(bool only_prepare)
+std::shared_ptr<Task> DerpFTBInstance::doUpdate(bool only_prepare)
 {
 	std::shared_ptr<SequentialTask> task;
 	task.reset(new SequentialTask(this));
@@ -114,12 +112,12 @@ std::shared_ptr<Task> OneSixFTBInstance::doUpdate(bool only_prepare)
 	{
 		task->addTask(std::shared_ptr<Task>(MMC->forgelist()->getLoadTask()));
 	}
-	task->addTask(OneSixInstance::doUpdate(only_prepare));
-	task->addTask(std::shared_ptr<Task>(new OneSixFTBInstanceForge(m_forge->version(), this, this)));
+	task->addTask(DerpInstance::doUpdate(only_prepare));
+	task->addTask(std::shared_ptr<Task>(new DerpFTBInstanceForge(m_forge->version(), this, this)));
 	//FIXME: yes. this may appear dumb. but the previous step can change the list, so we do it all again.
 	//TODO: Add a graph task. Construct graphs of tasks so we may capture the logic properly.
-	task->addTask(OneSixInstance::doUpdate(only_prepare));
+	task->addTask(DerpInstance::doUpdate(only_prepare));
 	return task;
 }
 
-#include "OneSixFTBInstance.moc"
+#include "DerpFTBInstance.moc"
diff --git a/logic/OneSixFTBInstance.h b/logic/DerpFTBInstance.h
index dc028819..c16998bf 100644
--- a/logic/OneSixFTBInstance.h
+++ b/logic/DerpFTBInstance.h
@@ -1,14 +1,14 @@
 #pragma once
 
-#include "OneSixInstance.h"
+#include "DerpInstance.h"
 
-class OneSixLibrary;
+class DerpLibrary;
 
-class OneSixFTBInstance : public OneSixInstance
+class DerpFTBInstance : public DerpInstance
 {
 	Q_OBJECT
 public:
-	explicit OneSixFTBInstance(const QString &rootDir, SettingsObject *settings,
+	explicit DerpFTBInstance(const QString &rootDir, SettingsObject *settings,
 							QObject *parent = 0);
 	virtual QString getStatusbarDescription();
 	virtual bool menuActionEnabled(QString action_name) const;
@@ -18,5 +18,5 @@ public:
 	virtual QString id() const;
 
 private:
-	std::shared_ptr<OneSixLibrary> m_forge;
+	std::shared_ptr<DerpLibrary> m_forge;
 };
diff --git a/logic/OneSixInstance.cpp b/logic/DerpInstance.cpp
index 3cfc1c76..31ed7c95 100644
--- a/logic/OneSixInstance.cpp
+++ b/logic/DerpInstance.cpp
@@ -13,37 +13,35 @@
  * limitations under the License.
  */
 
+#include "DerpInstance.h"
+
+#include <QIcon>
+
+#include "DerpInstance_p.h"
+#include "DerpUpdate.h"
+#include "DerpVersion.h"
+#include "pathutils.h"
+#include "logger/QsLog.h"
+#include "assets/AssetsUtils.h"
 #include "MultiMC.h"
-#include "OneSixInstance.h"
-#include "OneSixInstance_p.h"
-#include "OneSixUpdate.h"
+#include "icons/IconList.h"
 #include "MinecraftProcess.h"
-#include "OneSixVersion.h"
-#include "JavaChecker.h"
-#include "logic/icons/IconList.h"
-
-#include <setting.h>
-#include <pathutils.h>
-#include <cmdutils.h>
-#include <JlCompress.h>
-#include "gui/dialogs/OneSixModEditDialog.h"
-#include "logger/QsLog.h"
-#include "logic/assets/AssetsUtils.h"
-#include <QIcon>
+#include "gui/dialogs/DerpModEditDialog.h"
 
-OneSixInstance::OneSixInstance(const QString &rootDir, SettingsObject *setting_obj,
-							   QObject *parent)
-	: BaseInstance(new OneSixInstancePrivate(), rootDir, setting_obj, parent)
+DerpInstance::DerpInstance(const QString &rootDir, SettingsObject *settings, QObject *parent)
+	: BaseInstance(new DerpInstancePrivate(), rootDir, settings, parent)
 {
-	I_D(OneSixInstance);
+	I_D(DerpInstance);
 	d->m_settings->registerSetting("IntendedVersion", "");
 	d->m_settings->registerSetting("ShouldUpdate", false);
+	d->version.reset(new DerpVersion(this, this));
 	reloadFullVersion();
 }
 
-std::shared_ptr<Task> OneSixInstance::doUpdate(bool only_prepare)
+
+std::shared_ptr<Task> DerpInstance::doUpdate(bool only_prepare)
 {
-	return std::shared_ptr<Task>(new OneSixUpdate(this, only_prepare));
+	return std::shared_ptr<Task>(new DerpUpdate(this, only_prepare));
 }
 
 QString replaceTokensIn(QString text, QMap<QString, QString> with)
@@ -70,7 +68,7 @@ QString replaceTokensIn(QString text, QMap<QString, QString> with)
 	return result;
 }
 
-QDir OneSixInstance::reconstructAssets(std::shared_ptr<OneSixVersion> version)
+QDir DerpInstance::reconstructAssets(std::shared_ptr<DerpVersion> version)
 {
 	QDir assetsDir = QDir("assets/");
 	QDir indexDir = QDir(PathCombine(assetsDir.path(), "indexes"));
@@ -130,9 +128,9 @@ QDir OneSixInstance::reconstructAssets(std::shared_ptr<OneSixVersion> version)
 	return virtualRoot;
 }
 
-QStringList OneSixInstance::processMinecraftArgs(MojangAccountPtr account)
+QStringList DerpInstance::processMinecraftArgs(MojangAccountPtr account)
 {
-	I_D(OneSixInstance);
+	I_D(DerpInstance);
 	auto version = d->version;
 	QString args_pattern = version->minecraftArguments;
 
@@ -182,9 +180,9 @@ QStringList OneSixInstance::processMinecraftArgs(MojangAccountPtr account)
 	return parts;
 }
 
-MinecraftProcess *OneSixInstance::prepareForLaunch(MojangAccountPtr account)
+MinecraftProcess *DerpInstance::prepareForLaunch(MojangAccountPtr account)
 {
-	I_D(OneSixInstance);
+	I_D(DerpInstance);
 
 	QIcon icon = MMC->icons()->getIcon(iconKey());
 	auto pixmap = icon.pixmap(128, 128);
@@ -229,7 +227,9 @@ MinecraftProcess *OneSixInstance::prepareForLaunch(MojangAccountPtr account)
 	QDir natives_dir(PathCombine(instanceRoot(), "natives/"));
 	launchScript += "windowTitle " + windowTitle() + "\n";
 	launchScript += "natives " + natives_dir.absolutePath() + "\n";
-	launchScript += "launch onesix\n";
+	launchScript += "launch onesix";
+
+	qDebug() << launchScript;
 
 	// create the process and set its parameters
 	MinecraftProcess *proc = new MinecraftProcess(this);
@@ -239,16 +239,16 @@ MinecraftProcess *OneSixInstance::prepareForLaunch(MojangAccountPtr account)
 	return proc;
 }
 
-void OneSixInstance::cleanupAfterRun()
+void DerpInstance::cleanupAfterRun()
 {
 	QString target_dir = PathCombine(instanceRoot(), "natives/");
 	QDir dir(target_dir);
 	dir.removeRecursively();
 }
 
-std::shared_ptr<ModList> OneSixInstance::loaderModList()
+std::shared_ptr<ModList> DerpInstance::loaderModList()
 {
-	I_D(OneSixInstance);
+	I_D(DerpInstance);
 	if (!d->loader_mod_list)
 	{
 		d->loader_mod_list.reset(new ModList(loaderModsDir()));
@@ -257,9 +257,9 @@ std::shared_ptr<ModList> OneSixInstance::loaderModList()
 	return d->loader_mod_list;
 }
 
-std::shared_ptr<ModList> OneSixInstance::resourcePackList()
+std::shared_ptr<ModList> DerpInstance::resourcePackList()
 {
-	I_D(OneSixInstance);
+	I_D(DerpInstance);
 	if (!d->resource_pack_list)
 	{
 		d->resource_pack_list.reset(new ModList(resourcePacksDir()));
@@ -268,34 +268,32 @@ std::shared_ptr<ModList> OneSixInstance::resourcePackList()
 	return d->resource_pack_list;
 }
 
-QDialog *OneSixInstance::createModEditDialog(QWidget *parent)
+QDialog *DerpInstance::createModEditDialog(QWidget *parent)
 {
-	return new OneSixModEditDialog(this, parent);
+	return new DerpModEditDialog(this, parent);
 }
 
-bool OneSixInstance::setIntendedVersionId(QString version)
+bool DerpInstance::setIntendedVersionId(QString version)
 {
 	settings().set("IntendedVersion", version);
 	setShouldUpdate(true);
-	auto pathCustom = PathCombine(instanceRoot(), "custom.json");
 	auto pathOrig = PathCombine(instanceRoot(), "version.json");
-	QFile::remove(pathCustom);
 	QFile::remove(pathOrig);
 	reloadFullVersion();
 	return true;
 }
 
-QString OneSixInstance::intendedVersionId() const
+QString DerpInstance::intendedVersionId() const
 {
 	return settings().get("IntendedVersion").toString();
 }
 
-void OneSixInstance::setShouldUpdate(bool val)
+void DerpInstance::setShouldUpdate(bool val)
 {
 	settings().set("ShouldUpdate", val);
 }
 
-bool OneSixInstance::shouldUpdate() const
+bool DerpInstance::shouldUpdate() const
 {
 	QVariant var = settings().get("ShouldUpdate");
 	if (!var.isValid() || var.toBool() == false)
@@ -305,94 +303,53 @@ bool OneSixInstance::shouldUpdate() const
 	return true;
 }
 
-bool OneSixInstance::versionIsCustom()
+bool DerpInstance::versionIsCustom()
 {
-	QString verpath_custom = PathCombine(instanceRoot(), "custom.json");
-	QFile versionfile(verpath_custom);
-	return versionfile.exists();
+	QDir patches(PathCombine(instanceRoot(), "patches/"));
+	return QFile::exists(PathCombine(instanceRoot(), "custom.json"))
+			|| (patches.exists() && patches.count() >= 0);
 }
 
-QString OneSixInstance::currentVersionId() const
+QString DerpInstance::currentVersionId() const
 {
 	return intendedVersionId();
 }
 
-bool OneSixInstance::customizeVersion()
-{
-	if (!versionIsCustom())
-	{
-		auto pathCustom = PathCombine(instanceRoot(), "custom.json");
-		auto pathOrig = PathCombine(instanceRoot(), "version.json");
-		QFile::copy(pathOrig, pathCustom);
-		return reloadFullVersion();
-	}
-	else
-		return true;
-}
-
-bool OneSixInstance::revertCustomVersion()
-{
-	if (versionIsCustom())
-	{
-		auto path = PathCombine(instanceRoot(), "custom.json");
-		QFile::remove(path);
-		return reloadFullVersion();
-	}
-	else
-		return true;
-}
-
-bool OneSixInstance::reloadFullVersion()
+bool DerpInstance::reloadFullVersion(QWidget *widgetParent)
 {
-	I_D(OneSixInstance);
+	I_D(DerpInstance);
 
-	QString verpath = PathCombine(instanceRoot(), "version.json");
-	{
-		QString verpath_custom = PathCombine(instanceRoot(), "custom.json");
-		QFile versionfile(verpath_custom);
-		if (versionfile.exists())
-			verpath = verpath_custom;
-	}
-
-	auto version = OneSixVersion::fromFile(verpath);
-	if (version)
-	{
-		d->version = version;
-		return true;
-	}
-	else
-	{
-		d->version.reset();
-		return false;
-	}
+	bool ret = d->version->reload(widgetParent);
+	emit versionReloaded();
+	return ret;
 }
 
-std::shared_ptr<OneSixVersion> OneSixInstance::getFullVersion()
+std::shared_ptr<DerpVersion> DerpInstance::getFullVersion()
 {
-	I_D(OneSixInstance);
+	I_D(DerpInstance);
 	return d->version;
 }
 
-QString OneSixInstance::defaultBaseJar() const
+QString DerpInstance::defaultBaseJar() const
 {
 	return "versions/" + intendedVersionId() + "/" + intendedVersionId() + ".jar";
 }
 
-QString OneSixInstance::defaultCustomBaseJar() const
+QString DerpInstance::defaultCustomBaseJar() const
 {
 	return PathCombine(instanceRoot(), "custom.jar");
 }
 
-bool OneSixInstance::menuActionEnabled(QString action_name) const
+bool DerpInstance::menuActionEnabled(QString action_name) const
 {
 	if (action_name == "actionChangeInstLWJGLVersion")
 		return false;
 	return true;
 }
 
-QString OneSixInstance::getStatusbarDescription()
+QString DerpInstance::getStatusbarDescription()
 {
-	QString descr = "One Six : " + intendedVersionId();
+	QString descr = "Derp : " + intendedVersionId();
 	if (versionIsCustom())
 	{
 		descr + " (custom)";
@@ -400,17 +357,17 @@ QString OneSixInstance::getStatusbarDescription()
 	return descr;
 }
 
-QString OneSixInstance::loaderModsDir() const
+QString DerpInstance::loaderModsDir() const
 {
 	return PathCombine(minecraftRoot(), "mods");
 }
 
-QString OneSixInstance::resourcePacksDir() const
+QString DerpInstance::resourcePacksDir() const
 {
 	return PathCombine(minecraftRoot(), "resourcepacks");
 }
 
-QString OneSixInstance::instanceConfigFolder() const
+QString DerpInstance::instanceConfigFolder() const
 {
 	return PathCombine(minecraftRoot(), "config");
 }
diff --git a/logic/OneSixInstance.h b/logic/DerpInstance.h
index f869e345..37d3df52 100644
--- a/logic/OneSixInstance.h
+++ b/logic/DerpInstance.h
@@ -15,21 +15,17 @@
 
 #pragma once
 
-#include <QStringList>
-#include <QDir>
-
 #include "BaseInstance.h"
 
-class OneSixVersion;
-class Task;
-class ModList;
+#include "DerpVersion.h"
+#include "ModList.h"
 
-class OneSixInstance : public BaseInstance
+class DerpInstance : public BaseInstance
 {
 	Q_OBJECT
 public:
-	explicit OneSixInstance(const QString &rootDir, SettingsObject *settings,
-							QObject *parent = 0);
+	explicit DerpInstance(const QString &rootDir, SettingsObject *settings,
+						  QObject *parent = 0);
 
 	//////  Mod Lists  //////
 	std::shared_ptr<ModList> loaderModList();
@@ -55,14 +51,10 @@ public:
 
 	virtual QDialog *createModEditDialog(QWidget *parent) override;
 
-	/// reload the full version json file. return true on success!
-	bool reloadFullVersion();
+	/// reload the full version json files. return true on success!
+	bool reloadFullVersion(QWidget *widgetParent = 0);
 	/// get the current full version info
-	std::shared_ptr<OneSixVersion> getFullVersion();
-	/// revert the current custom version back to base
-	bool revertCustomVersion();
-	/// customize the current base version
-	bool customizeVersion();
+	std::shared_ptr<DerpVersion> getFullVersion();
 	/// is the current version original, or custom?
 	virtual bool versionIsCustom() override;
 
@@ -72,7 +64,10 @@ public:
 	virtual bool menuActionEnabled(QString action_name) const override;
 	virtual QString getStatusbarDescription() override;
 
+signals:
+	void versionReloaded();
+
 private:
 	QStringList processMinecraftArgs(MojangAccountPtr account);
-	QDir reconstructAssets(std::shared_ptr<OneSixVersion> version);
+	QDir reconstructAssets(std::shared_ptr<DerpVersion> version);
 };
diff --git a/logic/OneSixInstance_p.h b/logic/DerpInstance_p.h
index 6b7ea431..41f7b62d 100644
--- a/logic/OneSixInstance_p.h
+++ b/logic/DerpInstance_p.h
@@ -15,16 +15,13 @@
 
 #pragma once
 
-#include <memory>
+#include "BaseInstance_p.h"
+#include "DerpVersion.h"
+#include "ModList.h"
 
-#include "logic/BaseInstance_p.h"
-#include "logic/OneSixVersion.h"
-#include "logic/OneSixLibrary.h"
-#include "logic/ModList.h"
-
-struct OneSixInstancePrivate : public BaseInstancePrivate
+struct DerpInstancePrivate : public BaseInstancePrivate
 {
-	std::shared_ptr<OneSixVersion> version;
+	std::shared_ptr<DerpVersion> version;
 	std::shared_ptr<ModList> loader_mod_list;
 	std::shared_ptr<ModList> resource_pack_list;
-};
\ No newline at end of file
+};
diff --git a/logic/OneSixLibrary.cpp b/logic/DerpLibrary.cpp
index 7b80d5e7..ba4d516b 100644
--- a/logic/OneSixLibrary.cpp
+++ b/logic/DerpLibrary.cpp
@@ -15,15 +15,15 @@
 
 #include <QJsonArray>
 
-#include "OneSixLibrary.h"
-#include "OneSixRule.h"
+#include "DerpLibrary.h"
+#include "DerpRule.h"
 #include "OpSys.h"
 #include "logic/net/URLConstants.h"
 #include <pathutils.h>
 #include <JlCompress.h>
 #include "logger/QsLog.h"
 
-void OneSixLibrary::finalize()
+void DerpLibrary::finalize()
 {
 	QStringList parts = m_name.split(':');
 	QString relative = parts[0];
@@ -76,67 +76,67 @@ void OneSixLibrary::finalize()
 	}
 }
 
-void OneSixLibrary::setName(QString name)
+void DerpLibrary::setName(const QString &name)
 {
 	m_name = name;
 }
-void OneSixLibrary::setBaseUrl(QString base_url)
+void DerpLibrary::setBaseUrl(const QString &base_url)
 {
 	m_base_url = base_url;
 }
-void OneSixLibrary::setIsNative()
+void DerpLibrary::setIsNative()
 {
 	m_is_native = true;
 }
-void OneSixLibrary::addNative(OpSys os, QString suffix)
+void DerpLibrary::addNative(OpSys os, const QString &suffix)
 {
 	m_is_native = true;
 	m_native_suffixes[os] = suffix;
 }
-void OneSixLibrary::setRules(QList<std::shared_ptr<Rule>> rules)
+void DerpLibrary::setRules(QList<std::shared_ptr<Rule>> rules)
 {
 	m_rules = rules;
 }
-bool OneSixLibrary::isActive()
+bool DerpLibrary::isActive() const
 {
 	return m_is_active;
 }
-bool OneSixLibrary::isNative()
+bool DerpLibrary::isNative() const
 {
 	return m_is_native;
 }
-QString OneSixLibrary::downloadUrl()
+QString DerpLibrary::downloadUrl() const
 {
 	if (m_absolute_url.size())
 		return m_absolute_url;
 	return m_download_url;
 }
-QString OneSixLibrary::storagePath()
+QString DerpLibrary::storagePath() const
 {
 	return m_storage_path;
 }
 
-void OneSixLibrary::setAbsoluteUrl(QString absolute_url)
+void DerpLibrary::setAbsoluteUrl(const QString &absolute_url)
 {
 	m_absolute_url = absolute_url;
 }
 
-QString OneSixLibrary::absoluteUrl()
+QString DerpLibrary::absoluteUrl() const
 {
 	return m_absolute_url;
 }
 
-void OneSixLibrary::setHint(QString hint)
+void DerpLibrary::setHint(const QString &hint)
 {
 	m_hint = hint;
 }
 
-QString OneSixLibrary::hint()
+QString DerpLibrary::hint() const
 {
 	return m_hint;
 }
 
-bool OneSixLibrary::filesExist()
+bool DerpLibrary::filesExist()
 {
 	QString storage = storagePath();
 	if (storage.contains("${arch}"))
@@ -167,7 +167,7 @@ bool OneSixLibrary::filesExist()
 	return true;
 }
 
-bool OneSixLibrary::extractTo(QString target_dir)
+bool DerpLibrary::extractTo(QString target_dir)
 {
 	QString storage = storagePath();
 	if (storage.contains("${arch}"))
@@ -220,7 +220,7 @@ bool OneSixLibrary::extractTo(QString target_dir)
 	return true;
 }
 
-QJsonObject OneSixLibrary::toJson()
+QJsonObject DerpLibrary::toJson()
 {
 	QJsonObject libRoot;
 	libRoot.insert("name", m_name);
diff --git a/logic/OneSixLibrary.h b/logic/DerpLibrary.h
index 227cdbef..d1cee843 100644
--- a/logic/OneSixLibrary.h
+++ b/logic/DerpLibrary.h
@@ -26,7 +26,7 @@
 
 class Rule;
 
-class OneSixLibrary
+class DerpLibrary
 {
 private:
 	// basic values used internally (so far)
@@ -63,7 +63,7 @@ public:
 
 public:
 	/// Constructor
-	OneSixLibrary(QString name)
+	DerpLibrary(const QString &name)
 	{
 		m_name = name;
 	}
@@ -84,48 +84,48 @@ public:
 	void finalize();
 
 	/// Set the library composite name
-	void setName(QString name);
+	void setName(const QString &name);
 	/// get a decent-looking name
-	QString name()
+	QString name() const
 	{
 		return m_decentname;
 	}
 	/// get a decent-looking version
-	QString version()
+	QString version() const
 	{
 		return m_decentversion;
 	}
 	/// what kind of library is it? (for display)
-	QString type()
+	QString type() const
 	{
 		return m_decenttype;
 	}
 	/// Set the url base for downloads
-	void setBaseUrl(QString base_url);
+	void setBaseUrl(const QString &base_url);
 
 	/// Call this to mark the library as 'native' (it's a zip archive with DLLs)
 	void setIsNative();
 	/// Attach a name suffix to the specified OS native
-	void addNative(OpSys os, QString suffix);
+	void addNative(OpSys os, const QString &suffix);
 	/// Set the load rules
 	void setRules(QList<std::shared_ptr<Rule>> rules);
 
 	/// Returns true if the library should be loaded (or extracted, in case of natives)
-	bool isActive();
+	bool isActive() const;
 	/// Returns true if the library is native
-	bool isNative();
+	bool isNative() const;
 	/// Get the URL to download the library from
-	QString downloadUrl();
+	QString downloadUrl() const;
 	/// Get the relative path where the library should be saved
-	QString storagePath();
+	QString storagePath() const;
 
 	/// set an absolute URL for the library. This is an MMC extension.
-	void setAbsoluteUrl(QString absolute_url);
-	QString absoluteUrl();
+	void setAbsoluteUrl(const QString &absolute_url);
+	QString absoluteUrl() const;
 
 	/// set a hint about how to treat the library. This is an MMC extension.
-	void setHint(QString hint);
-	QString hint();
+	void setHint(const QString &hint);
+	QString hint() const;
 
 	bool extractTo(QString target_dir);
 	bool filesExist();
diff --git a/logic/OneSixRule.cpp b/logic/DerpRule.cpp
index 392b1dd1..d4cf1ba3 100644
--- a/logic/OneSixRule.cpp
+++ b/logic/DerpRule.cpp
@@ -16,7 +16,7 @@
 #include <QJsonObject>
 #include <QJsonArray>
 
-#include "OneSixRule.h"
+#include "DerpRule.h"
 
 QList<std::shared_ptr<Rule>> rulesFromJsonV4(QJsonObject &objectWithRules)
 {
@@ -86,4 +86,4 @@ RuleAction RuleAction_fromString(QString name)
 	if (name == "disallow")
 		return Disallow;
 	return Defer;
-}
\ No newline at end of file
+}
diff --git a/logic/OneSixRule.h b/logic/DerpRule.h
index 5a13cbd9..7895ea98 100644
--- a/logic/OneSixRule.h
+++ b/logic/DerpRule.h
@@ -17,7 +17,7 @@
 
 #include <QString>
 
-#include "logic/OneSixLibrary.h"
+#include "logic/DerpLibrary.h"
 
 enum RuleAction
 {
@@ -33,7 +33,7 @@ class Rule
 {
 protected:
 	RuleAction m_result;
-	virtual bool applies(OneSixLibrary *parent) = 0;
+	virtual bool applies(DerpLibrary *parent) = 0;
 
 public:
 	Rule(RuleAction result) : m_result(result)
@@ -41,7 +41,7 @@ public:
 	}
 	virtual ~Rule() {};
 	virtual QJsonObject toJson() = 0;
-	RuleAction apply(OneSixLibrary *parent)
+	RuleAction apply(DerpLibrary *parent)
 	{
 		if (applies(parent))
 			return m_result;
@@ -60,7 +60,7 @@ private:
 	QString m_version_regexp;
 
 protected:
-	virtual bool applies(OneSixLibrary *)
+	virtual bool applies(DerpLibrary *)
 	{
 		return (m_system == currentSystem);
 	}
@@ -81,7 +81,7 @@ public:
 class ImplicitRule : public Rule
 {
 protected:
-	virtual bool applies(OneSixLibrary *)
+	virtual bool applies(DerpLibrary *)
 	{
 		return true;
 	}
diff --git a/logic/OneSixUpdate.cpp b/logic/DerpUpdate.cpp
index 0119ab07..e1600d28 100644
--- a/logic/OneSixUpdate.cpp
+++ b/logic/DerpUpdate.cpp
@@ -14,7 +14,7 @@
  */
 
 #include "MultiMC.h"
-#include "OneSixUpdate.h"
+#include "DerpUpdate.h"
 
 #include <QtNetwork>
 
@@ -25,9 +25,9 @@
 
 #include "BaseInstance.h"
 #include "lists/MinecraftVersionList.h"
-#include "OneSixVersion.h"
-#include "OneSixLibrary.h"
-#include "OneSixInstance.h"
+#include "DerpVersion.h"
+#include "DerpLibrary.h"
+#include "DerpInstance.h"
 #include "net/ForgeMirrors.h"
 #include "net/URLConstants.h"
 #include "assets/AssetsUtils.h"
@@ -35,12 +35,12 @@
 #include "pathutils.h"
 #include <JlCompress.h>
 
-OneSixUpdate::OneSixUpdate(BaseInstance *inst, bool only_prepare, QObject *parent)
+DerpUpdate::DerpUpdate(BaseInstance *inst, bool only_prepare, QObject *parent)
 	: Task(parent), m_inst(inst), m_only_prepare(only_prepare)
 {
 }
 
-void OneSixUpdate::executeTask()
+void DerpUpdate::executeTask()
 {
 	QString intendedVersion = m_inst->intendedVersionId();
 
@@ -77,7 +77,7 @@ void OneSixUpdate::executeTask()
 	}
 }
 
-void OneSixUpdate::versionFileStart()
+void DerpUpdate::versionFileStart()
 {
 	QLOG_INFO() << m_inst->name() << ": getting version file.";
 	setStatus(tr("Getting the version files from Mojang..."));
@@ -94,10 +94,10 @@ void OneSixUpdate::versionFileStart()
 	specificVersionDownloadJob->start();
 }
 
-void OneSixUpdate::versionFileFinished()
+void DerpUpdate::versionFileFinished()
 {
 	NetActionPtr DlJob = specificVersionDownloadJob->first();
-	OneSixInstance *inst = (OneSixInstance *)m_inst;
+	DerpInstance *inst = (DerpInstance *)m_inst;
 
 	QString version_id = targetVersion->descriptor();
 	QString inst_dir = m_inst->instanceRoot();
@@ -142,16 +142,16 @@ void OneSixUpdate::versionFileFinished()
 	jarlibStart();
 }
 
-void OneSixUpdate::versionFileFailed()
+void DerpUpdate::versionFileFailed()
 {
 	emitFailed("Failed to download the version description. Try again.");
 }
 
-void OneSixUpdate::assetIndexStart()
+void DerpUpdate::assetIndexStart()
 {
 	setStatus(tr("Updating assets index..."));
-	OneSixInstance *inst = (OneSixInstance *)m_inst;
-	std::shared_ptr<OneSixVersion> version = inst->getFullVersion();
+	DerpInstance *inst = (DerpInstance *)m_inst;
+	std::shared_ptr<DerpVersion> version = inst->getFullVersion();
 	QString assetName = version->assets;
 	QUrl indexUrl = "http://" + URLConstants::AWS_DOWNLOAD_INDEXES + assetName + ".json";
 	QString localPath = assetName + ".json";
@@ -170,12 +170,12 @@ void OneSixUpdate::assetIndexStart()
 	jarlibDownloadJob->start();
 }
 
-void OneSixUpdate::assetIndexFinished()
+void DerpUpdate::assetIndexFinished()
 {
 	AssetsIndex index;
 
-	OneSixInstance *inst = (OneSixInstance *)m_inst;
-	std::shared_ptr<OneSixVersion> version = inst->getFullVersion();
+	DerpInstance *inst = (DerpInstance *)m_inst;
+	std::shared_ptr<DerpVersion> version = inst->getFullVersion();
 	QString assetName = version->assets;
 
 	QString asset_fname = "assets/indexes/" + assetName + ".json";
@@ -215,26 +215,26 @@ void OneSixUpdate::assetIndexFinished()
 	assetsFinished();
 }
 
-void OneSixUpdate::assetIndexFailed()
+void DerpUpdate::assetIndexFailed()
 {
 	emitFailed("Failed to download the assets index!");
 }
 
-void OneSixUpdate::assetsFinished()
+void DerpUpdate::assetsFinished()
 {
 	prepareForLaunch();
 }
 
-void OneSixUpdate::assetsFailed()
+void DerpUpdate::assetsFailed()
 {
 	emitFailed("Failed to download assets!");
 }
 
-void OneSixUpdate::jarlibStart()
+void DerpUpdate::jarlibStart()
 {
 	setStatus(tr("Getting the library files from Mojang..."));
 	QLOG_INFO() << m_inst->name() << ": downloading libraries";
-	OneSixInstance *inst = (OneSixInstance *)m_inst;
+	DerpInstance *inst = (DerpInstance *)m_inst;
 	bool successful = inst->reloadFullVersion();
 	if (!successful)
 	{
@@ -244,7 +244,7 @@ void OneSixUpdate::jarlibStart()
 	}
 
 	// Build a list of URLs that will need to be downloaded.
-	std::shared_ptr<OneSixVersion> version = inst->getFullVersion();
+	std::shared_ptr<DerpVersion> version = inst->getFullVersion();
 	// minecraft.jar for this version
 	{
 		QString version_id = version->id;
@@ -318,12 +318,12 @@ void OneSixUpdate::jarlibStart()
 	jarlibDownloadJob->start();
 }
 
-void OneSixUpdate::jarlibFinished()
+void DerpUpdate::jarlibFinished()
 {
 	assetIndexStart();
 }
 
-void OneSixUpdate::jarlibFailed()
+void DerpUpdate::jarlibFailed()
 {
 	QStringList failed = jarlibDownloadJob->getFailedFiles();
 	QString failed_all = failed.join("\n");
@@ -331,17 +331,17 @@ void OneSixUpdate::jarlibFailed()
 			   "\n\nPlease try again.");
 }
 
-void OneSixUpdate::prepareForLaunch()
+void DerpUpdate::prepareForLaunch()
 {
 	setStatus(tr("Preparing for launch..."));
 	QLOG_INFO() << m_inst->name() << ": preparing for launch";
-	auto onesix_inst = (OneSixInstance *)m_inst;
+	auto derp_inst = (DerpInstance *)m_inst;
 
 	// delete any leftovers, if they are present.
-	onesix_inst->cleanupAfterRun();
+	derp_inst->cleanupAfterRun();
 
-	QString natives_dir_raw = PathCombine(onesix_inst->instanceRoot(), "natives/");
-	auto version = onesix_inst->getFullVersion();
+	QString natives_dir_raw = PathCombine(derp_inst->instanceRoot(), "natives/");
+	auto version = derp_inst->getFullVersion();
 	if (!version)
 	{
 		emitFailed("The version information for this instance is not complete. Try re-creating "
diff --git a/logic/OneSixUpdate.h b/logic/DerpUpdate.h
index bc717a94..475f6c35 100644
--- a/logic/OneSixUpdate.h
+++ b/logic/DerpUpdate.h
@@ -25,11 +25,11 @@
 class MinecraftVersion;
 class BaseInstance;
 
-class OneSixUpdate : public Task
+class DerpUpdate : public Task
 {
 	Q_OBJECT
 public:
-	explicit OneSixUpdate(BaseInstance *inst, bool prepare_for_launch, QObject *parent = 0);
+	explicit DerpUpdate(BaseInstance *inst, bool prepare_for_launch, QObject *parent = 0);
 	virtual void executeTask();
 
 private
diff --git a/logic/DerpVersion.cpp b/logic/DerpVersion.cpp
new file mode 100644
index 00000000..f13ac620
--- /dev/null
+++ b/logic/DerpVersion.cpp
@@ -0,0 +1,164 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "DerpVersion.h"
+
+#include <QDebug>
+
+#include "DerpVersionBuilder.h"
+
+DerpVersion::DerpVersion(DerpInstance *instance, QObject *parent)
+	: QAbstractListModel(parent), m_instance(instance)
+{
+}
+
+bool DerpVersion::reload(QWidget *widgetParent)
+{
+	return DerpVersionBuilder::build(this, m_instance, widgetParent);
+}
+
+QList<std::shared_ptr<DerpLibrary> > DerpVersion::getActiveNormalLibs()
+{
+	QList<std::shared_ptr<DerpLibrary> > output;
+	for (auto lib : libraries)
+	{
+		if (lib->isActive() && !lib->isNative())
+		{
+			output.append(lib);
+		}
+	}
+	return output;
+}
+
+QList<std::shared_ptr<DerpLibrary> > DerpVersion::getActiveNativeLibs()
+{
+	QList<std::shared_ptr<DerpLibrary> > output;
+	for (auto lib : libraries)
+	{
+		if (lib->isActive() && lib->isNative())
+		{
+			output.append(lib);
+		}
+	}
+	return output;
+}
+
+QVariant DerpVersion::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid())
+		return QVariant();
+
+	int row = index.row();
+	int column = index.column();
+
+	if (row < 0 || row >= libraries.size())
+		return QVariant();
+
+	if (role == Qt::DisplayRole)
+	{
+		switch (column)
+		{
+		case 0:
+			return libraries[row]->name();
+		case 1:
+			return libraries[row]->type();
+		case 2:
+			return libraries[row]->version();
+		default:
+			return QVariant();
+		}
+	}
+	return QVariant();
+}
+
+Qt::ItemFlags DerpVersion::flags(const QModelIndex &index) const
+{
+	if (!index.isValid())
+		return Qt::NoItemFlags;
+	int row = index.row();
+	if (libraries[row]->isActive())
+	{
+		return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemNeverHasChildren;
+	}
+	else
+	{
+		return Qt::ItemNeverHasChildren;
+	}
+	// return QAbstractListModel::flags(index);
+}
+
+QVariant DerpVersion::headerData(int section, Qt::Orientation orientation, int role) const
+{
+	if (role != Qt::DisplayRole || orientation != Qt::Horizontal)
+		return QVariant();
+	switch (section)
+	{
+	case 0:
+		return QString("Name");
+	case 1:
+		return QString("Type");
+	case 2:
+		return QString("Version");
+	default:
+		return QString();
+	}
+}
+
+int DerpVersion::rowCount(const QModelIndex &parent) const
+{
+	return libraries.size();
+}
+
+int DerpVersion::columnCount(const QModelIndex &parent) const
+{
+	return 3;
+}
+
+QDebug operator<<(QDebug &dbg, const DerpVersion *version)
+{
+	dbg.nospace() << "DerpVersion("
+				  << "\n\tid=" << version->id
+				  << "\n\ttime=" << version->time
+				  << "\n\treleaseTime=" << version->releaseTime
+				  << "\n\ttype=" << version->type
+				  << "\n\tassets=" << version->assets
+				  << "\n\tprocessArguments=" << version->processArguments
+				  << "\n\tminecraftArguments=" << version->minecraftArguments
+				  << "\n\tminimumLauncherVersion=" << version->minimumLauncherVersion
+				  << "\n\tmainClass=" << version->mainClass
+				  << "\n\tlibraries=";
+	for (auto lib : version->libraries)
+	{
+		dbg.nospace() << "\n\t\t" << lib.get();
+	}
+	dbg.nospace() << "\n)";
+	return dbg.maybeSpace();
+}
+QDebug operator<<(QDebug &dbg, const DerpLibrary *library)
+{
+	dbg.nospace() << "DerpLibrary("
+				  << "\n\t\t\trawName=" << library->rawName()
+				  << "\n\t\t\tname=" << library->name()
+				  << "\n\t\t\tversion=" << library->version()
+				  << "\n\t\t\ttype=" << library->type()
+				  << "\n\t\t\tisActive=" << library->isActive()
+				  << "\n\t\t\tisNative=" << library->isNative()
+				  << "\n\t\t\tdownloadUrl=" << library->downloadUrl()
+				  << "\n\t\t\tstoragePath=" << library->storagePath()
+				  << "\n\t\t\tabsolutePath=" << library->absoluteUrl()
+				  << "\n\t\t\thint=" << library->hint();
+	dbg.nospace() << "\n\t\t)";
+	return dbg.maybeSpace();
+}
diff --git a/logic/DerpVersion.h b/logic/DerpVersion.h
new file mode 100644
index 00000000..cadfa850
--- /dev/null
+++ b/logic/DerpVersion.h
@@ -0,0 +1,110 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QAbstractListModel>
+
+#include <QString>
+#include <QList>
+#include <memory>
+
+#include "DerpLibrary.h"
+
+class DerpInstance;
+
+class DerpVersion : public QAbstractListModel
+{
+	Q_OBJECT
+public:
+	explicit DerpVersion(DerpInstance *instance, QObject *parent = 0);
+
+	virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+	virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
+	virtual QVariant headerData(int section, Qt::Orientation orientation,
+								int role = Qt::DisplayRole) const;
+	virtual int columnCount(const QModelIndex &parent) const;
+	virtual Qt::ItemFlags flags(const QModelIndex &index) const;
+
+	bool reload(QWidget *widgetParent);
+
+public:
+	QList<std::shared_ptr<DerpLibrary>> getActiveNormalLibs();
+	QList<std::shared_ptr<DerpLibrary>> getActiveNativeLibs();
+
+	// data members
+public:
+	/// the ID - determines which jar to use! ACTUALLY IMPORTANT!
+	QString id;
+	/// Last updated time - as a string
+	QString time;
+	/// Release time - as a string
+	QString releaseTime;
+	/// Release type - "release" or "snapshot"
+	QString type;
+	/// Assets type - "legacy" or a version ID
+	QString assets;
+	/**
+	 * DEPRECATED: Old versions of the new vanilla launcher used this
+	 * ex: "username_session_version"
+	 */
+	QString processArguments;
+	/**
+	 * arguments that should be used for launching minecraft
+	 *
+	 * ex: "--username ${auth_player_name} --session ${auth_session}
+	 *      --version ${version_name} --gameDir ${game_directory} --assetsDir ${game_assets}"
+	 */
+	QString minecraftArguments;
+	/**
+	 * the minimum launcher version required by this version ... current is 4 (at point of
+	 * writing)
+	 */
+	int minimumLauncherVersion = 0xDEADBEEF;
+	/**
+	 * The main class to load first
+	 */
+	QString mainClass;
+
+	/// the list of libs - both active and inactive, native and java
+	QList<std::shared_ptr<DerpLibrary>> libraries;
+
+	/*
+	FIXME: add support for those rules here? Looks like a pile of quick hacks to me though.
+
+	"rules": [
+		{
+		"action": "allow"
+		},
+		{
+		"action": "disallow",
+		"os": {
+			"name": "osx",
+			"version": "^10\\.5\\.\\d$"
+		}
+		}
+	],
+	"incompatibilityReason": "There is a bug in LWJGL which makes it incompatible with OSX
+	10.5.8. Please go to New Profile and use 1.5.2 for now. Sorry!"
+	}
+	*/
+	// QList<Rule> rules;
+
+private:
+	DerpInstance *m_instance;
+};
+
+QDebug operator<<(QDebug &dbg, const DerpVersion *version);
+QDebug operator<<(QDebug &dbg, const DerpLibrary *library);
diff --git a/logic/DerpVersionBuilder.cpp b/logic/DerpVersionBuilder.cpp
new file mode 100644
index 00000000..d8091f32
--- /dev/null
+++ b/logic/DerpVersionBuilder.cpp
@@ -0,0 +1,279 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "DerpVersionBuilder.h"
+
+#include <QList>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QFile>
+#include <QFileInfo>
+#include <QMessageBox>
+#include <QObject>
+#include <QDir>
+
+#include "DerpVersion.h"
+#include "DerpInstance.h"
+#include "DerpRule.h"
+
+DerpVersionBuilder::DerpVersionBuilder()
+{
+
+}
+
+bool DerpVersionBuilder::build(DerpVersion *version, DerpInstance *instance, QWidget *widgetParent)
+{
+	DerpVersionBuilder builder;
+	builder.m_version = version;
+	builder.m_instance = instance;
+	builder.m_widgetParent = widgetParent;
+	return builder.build();
+}
+
+bool DerpVersionBuilder::build()
+{
+	clear();
+
+	QDir root(m_instance->instanceRoot());
+	QDir patches(root.absoluteFilePath("patches/"));
+
+	// version.json -> patches/*.json -> custom.json
+
+	// version.json
+	{
+		QJsonObject obj;
+		if (!read(QFileInfo(root.absoluteFilePath("version.json")), &obj))
+		{
+			return false;
+		}
+		if (!apply(obj))
+		{
+			return false;
+		}
+	}
+
+	// patches/
+	{
+		// load all, put into map for ordering, apply in the right order
+
+		QMap<int, QJsonObject> objects;
+		for (auto info : patches.entryInfoList(QStringList() << "*.json", QDir::Files))
+		{
+			QJsonObject obj;
+			if (!read(info, &obj))
+			{
+				return false;
+			}
+			if (!obj.contains("order") || !obj.value("order").isDouble())
+			{
+				QMessageBox::critical(m_widgetParent, QObject::tr("Error"), QObject::tr("Missing or invalid 'order' in %1").arg(info.absoluteFilePath()));
+				return false;
+			}
+			objects.insert(obj.value("order").toDouble(), obj);
+		}
+		for (auto object : objects.values())
+		{
+			if (!apply(object))
+			{
+				return false;
+			}
+		}
+	}
+
+	// custom.json
+	{
+		if (QFile::exists(root.absoluteFilePath("custom.json")))
+		{
+			QJsonObject obj;
+			if (!read(QFileInfo(root.absoluteFilePath("custom.json")), &obj))
+			{
+				return false;
+			}
+			if (!apply(obj))
+			{
+				return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+void DerpVersionBuilder::clear()
+{
+	m_version->id.clear();
+	m_version->time.clear();
+	m_version->releaseTime.clear();
+	m_version->type.clear();
+	m_version->assets.clear();
+	m_version->processArguments.clear();
+	m_version->minecraftArguments.clear();
+	m_version->minimumLauncherVersion = 0xDEADBEAF;
+	m_version->mainClass.clear();
+	m_version->libraries.clear();
+}
+
+void applyString(const QJsonObject &obj, const QString &key, QString &out)
+{
+	if (obj.contains(key) && obj.value(key).isString())
+	{
+		out = obj.value(key).toString();
+	}
+}
+void applyString(const QJsonObject &obj, const QString &key, std::shared_ptr<DerpLibrary> lib, void(DerpLibrary::*func)(const QString &val))
+{
+	if (obj.contains(key) && obj.value(key).isString())
+	{
+		(lib.get()->*func)(obj.value(key).toString());
+	}
+}
+bool DerpVersionBuilder::apply(const QJsonObject &object)
+{
+	applyString(object, "id", m_version->id);
+	applyString(object, "mainClass", m_version->mainClass);
+	applyString(object, "processArguments", m_version->processArguments);
+	{
+		const QString toCompare = m_version->processArguments.toLower();
+		if (toCompare == "legacy")
+		{
+			m_version->minecraftArguments = " ${auth_player_name} ${auth_session}";
+		}
+		else if (toCompare == "username_session")
+		{
+			m_version->minecraftArguments = "--username ${auth_player_name} --session ${auth_session}";
+		}
+		else if (toCompare == "username_session_version")
+		{
+			m_version->minecraftArguments = "--username ${auth_player_name} --session ${auth_session} --version ${profile_name}";
+		}
+	}
+	applyString(object, "minecraftArguments", m_version->minecraftArguments);
+	applyString(object, "type", m_version->type);
+	applyString(object, "releaseTime", m_version->releaseTime);
+	applyString(object, "time", m_version->time);
+	applyString(object, "assets", m_version->assets);
+	{
+		if (m_version->assets.isEmpty())
+		{
+			m_version->assets = "legacy";
+		}
+	}
+	if (object.contains("minimumLauncherVersion"))
+	{
+		auto minLauncherVersionVal = object.value("minimumLauncherVersion");
+		if (minLauncherVersionVal.isDouble())
+		{
+			m_version->minimumLauncherVersion = minLauncherVersionVal.toDouble();
+		}
+	}
+
+	// libraries
+	{
+		auto librariesValue = object.value("libraries");
+		if (!librariesValue.isArray())
+		{
+			QMessageBox::critical(m_widgetParent, QObject::tr("Error"), QObject::tr("One json files contains a libraries field, but it's not an array"));
+			return false;
+		}
+		for (auto libVal : librariesValue.toArray())
+		{
+			if (!libVal.isObject())
+			{
+				continue;
+			}
+
+			QJsonObject libObj = libVal.toObject();
+
+			// Library name
+			auto nameVal = libObj.value("name");
+			if (!nameVal.isString())
+			{
+				continue;
+			}
+			std::shared_ptr<DerpLibrary> library(new DerpLibrary(nameVal.toString()));
+
+			applyString(libObj, "url", library, &DerpLibrary::setBaseUrl);
+			applyString(libObj, "MMC-hint", library, &DerpLibrary::setHint);
+			applyString(libObj, "MMC-absulute_url", library, &DerpLibrary::setAbsoluteUrl);
+			applyString(libObj, "MMC-absoluteUrl", library, &DerpLibrary::setAbsoluteUrl);
+
+			auto extractVal = libObj.value("extract");
+			if (extractVal.isObject())
+			{
+				QStringList excludes;
+				auto extractObj = extractVal.toObject();
+				auto excludesVal = extractObj.value("exclude");
+				if (excludesVal.isArray())
+				{
+					auto excludesList = excludesVal.toArray();
+					for (auto excludeVal : excludesList)
+					{
+						if (excludeVal.isString())
+						{
+							excludes.append(excludeVal.toString());
+						}
+					}
+					library->extract_excludes = excludes;
+				}
+			}
+
+			auto nativesVal = libObj.value("natives");
+			if (nativesVal.isObject())
+			{
+				library->setIsNative();
+				auto nativesObj = nativesVal.toObject();
+				for (auto it = nativesObj.begin(); it != nativesObj.end(); ++it)
+				{
+					auto osType = OpSys_fromString(it.key());
+					if (osType == Os_Other)
+					{
+						continue;
+					}
+					if (!it.value().isString())
+					{
+						continue;
+					}
+					library->addNative(osType, it.value().toString());
+				}
+			}
+
+			library->setRules(rulesFromJsonV4(libObj));
+			library->finalize();
+			m_version->libraries.append(library);
+		}
+	}
+
+	return true;
+}
+
+bool DerpVersionBuilder::read(const QFileInfo &fileInfo, QJsonObject *out)
+{
+	QFile file(fileInfo.absoluteFilePath());
+	if (!file.open(QFile::ReadOnly))
+	{
+		QMessageBox::critical(m_widgetParent, QObject::tr("Error"), QObject::tr("Unable to open %1: %2").arg(file.fileName(), file.errorString()));
+		return false;
+	}
+	QJsonParseError error;
+	QJsonDocument doc = QJsonDocument::fromJson(file.readAll(), &error);
+	if (error.error != QJsonParseError::NoError)
+	{
+		QMessageBox::critical(m_widgetParent, QObject::tr("Error"), QObject::tr("Unable to parse %1: %2 at %3").arg(file.fileName(), error.errorString()).arg(error.offset));
+		return false;
+	}
+	*out = doc.object();
+	return true;
+}
diff --git a/logic/DerpVersionBuilder.h b/logic/DerpVersionBuilder.h
new file mode 100644
index 00000000..739065db
--- /dev/null
+++ b/logic/DerpVersionBuilder.h
@@ -0,0 +1,43 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QString>
+
+class DerpVersion;
+class DerpInstance;
+class QWidget;
+class QJsonObject;
+class QFileInfo;
+
+class DerpVersionBuilder
+{
+	DerpVersionBuilder();
+public:
+	static bool build(DerpVersion *version, DerpInstance *instance, QWidget *widgetParent);
+
+private:
+	DerpVersion *m_version;
+	DerpInstance *m_instance;
+	QWidget *m_widgetParent;
+
+	bool build();
+
+	void clear();
+	bool apply(const QJsonObject &object);
+
+	bool read(const QFileInfo &fileInfo, QJsonObject *out);
+};
diff --git a/logic/ForgeInstaller.cpp b/logic/ForgeInstaller.cpp
index 8d4c5b41..29735a7d 100644
--- a/logic/ForgeInstaller.cpp
+++ b/logic/ForgeInstaller.cpp
@@ -14,8 +14,8 @@
  */
 
 #include "ForgeInstaller.h"
-#include "OneSixVersion.h"
-#include "OneSixLibrary.h"
+#include "DerpVersion.h"
+#include "DerpLibrary.h"
 #include "net/HttpMetaCache.h"
 #include <quazip.h>
 #include <quazipfile.h>
@@ -23,9 +23,15 @@
 #include <QStringList>
 #include "MultiMC.h"
 
+#include <QJsonDocument>
+#include <QSaveFile>
+#include <QCryptographicHash>
+
+// DERPFIX
+
 ForgeInstaller::ForgeInstaller(QString filename, QString universal_url)
 {
-	std::shared_ptr<OneSixVersion> newVersion;
+	std::shared_ptr<DerpVersion> newVersion;
 	m_universal_url = universal_url;
 
 	QuaZip zip(filename);
@@ -58,7 +64,7 @@ ForgeInstaller::ForgeInstaller(QString filename, QString universal_url)
 
 	// read the forge version info
 	{
-		newVersion = OneSixVersion::fromJson(versionInfoVal.toObject());
+		// DERPFIX newVersion = DerpVersion::fromJson(versionInfoVal.toObject());
 		if (!newVersion)
 			return;
 	}
@@ -68,7 +74,7 @@ ForgeInstaller::ForgeInstaller(QString filename, QString universal_url)
 	internalPath = installObj.value("filePath").toString();
 
 	// where do we put the library? decode the mojang path
-	OneSixLibrary lib(libraryName);
+	DerpLibrary lib(libraryName);
 	lib.finalize();
 
 	auto cacheentry = MMC->metacache()->resolveEntry("libraries", lib.storagePath());
@@ -103,11 +109,10 @@ ForgeInstaller::ForgeInstaller(QString filename, QString universal_url)
 	realVersionId = m_forge_version->id = installObj.value("minecraft").toString();
 }
 
-bool ForgeInstaller::apply(std::shared_ptr<OneSixVersion> to)
+bool ForgeInstaller::apply(std::shared_ptr<DerpVersion> to)
 {
 	if (!m_forge_version)
 		return false;
-	to->externalUpdateStart();
 	int sliding_insert_window = 0;
 	{
 		// for each library in the version we are adding (except for the blacklisted)
@@ -150,6 +155,5 @@ bool ForgeInstaller::apply(std::shared_ptr<OneSixVersion> to)
 		to->minecraftArguments = m_forge_version->minecraftArguments;
 		to->processArguments = m_forge_version->processArguments;
 	}
-	to->externalUpdateFinish();
-	return to->toOriginalFile();
+	return true;
 }
diff --git a/logic/ForgeInstaller.h b/logic/ForgeInstaller.h
index 0b9f9c77..65cad87c 100644
--- a/logic/ForgeInstaller.h
+++ b/logic/ForgeInstaller.h
@@ -17,18 +17,18 @@
 #include <QString>
 #include <memory>
 
-class OneSixVersion;
+class DerpVersion;
 
 class ForgeInstaller
 {
 public:
 	ForgeInstaller(QString filename, QString universal_url);
 
-	bool apply(std::shared_ptr<OneSixVersion> to);
+	bool apply(std::shared_ptr<DerpVersion> to);
 
 private:
 	// the version, read from the installer
-	std::shared_ptr<OneSixVersion> m_forge_version;
+	std::shared_ptr<DerpVersion> m_forge_version;
 	QString internalPath;
 	QString finalPath;
 	QString realVersionId;
diff --git a/logic/InstanceFactory.cpp b/logic/InstanceFactory.cpp
index 1f1a5879..c50ec4e4 100644
--- a/logic/InstanceFactory.cpp
+++ b/logic/InstanceFactory.cpp
@@ -21,9 +21,10 @@
 #include "BaseInstance.h"
 #include "LegacyInstance.h"
 #include "LegacyFTBInstance.h"
-#include "OneSixInstance.h"
-#include "OneSixFTBInstance.h"
+#include "DerpInstance.h"
+#include "DerpFTBInstance.h"
 #include "NostalgiaInstance.h"
+#include "DerpInstance.h"
 #include "BaseVersion.h"
 #include "MinecraftVersion.h"
 
@@ -50,13 +51,13 @@ InstanceFactory::InstLoadError InstanceFactory::loadInstance(BaseInstance *&inst
 	QString inst_type = m_settings->get("InstanceType").toString();
 
 	// FIXME: replace with a map lookup, where instance classes register their types
-	if (inst_type == "Legacy")
+	if (inst_type == "Derp" || inst_type == "OneSix")
 	{
-		inst = new LegacyInstance(instDir, m_settings, this);
+		inst = new DerpInstance(instDir, m_settings, this);
 	}
-	else if (inst_type == "OneSix")
+	else if (inst_type == "Legacy")
 	{
-		inst = new OneSixInstance(instDir, m_settings, this);
+		inst = new LegacyInstance(instDir, m_settings, this);
 	}
 	else if (inst_type == "Nostalgia")
 	{
@@ -66,9 +67,9 @@ InstanceFactory::InstLoadError InstanceFactory::loadInstance(BaseInstance *&inst
 	{
 		inst = new LegacyFTBInstance(instDir, m_settings, this);
 	}
-	else if (inst_type == "OneSixFTB")
+	else if (inst_type == "OneSixFTB" || inst_type == "DerpFTB")
 	{
-		inst = new OneSixFTBInstance(instDir, m_settings, this);
+		inst = new DerpFTBInstance(instDir, m_settings, this);
 	}
 	else
 	{
@@ -101,14 +102,15 @@ InstanceFactory::InstCreateError InstanceFactory::createInstance(BaseInstance *&
 		switch (mcVer->type)
 		{
 		case MinecraftVersion::Legacy:
+			// TODO derp
 			m_settings->set("InstanceType", "Legacy");
 			inst = new LegacyInstance(instDir, m_settings, this);
 			inst->setIntendedVersionId(version->descriptor());
 			inst->setShouldUseCustomBaseJar(false);
 			break;
-		case MinecraftVersion::OneSix:
-			m_settings->set("InstanceType", "OneSix");
-			inst = new OneSixInstance(instDir, m_settings, this);
+		case MinecraftVersion::Derp:
+			m_settings->set("InstanceType", "Derp");
+			inst = new DerpInstance(instDir, m_settings, this);
 			inst->setIntendedVersionId(version->descriptor());
 			inst->setShouldUseCustomBaseJar(false);
 			break;
@@ -135,9 +137,9 @@ InstanceFactory::InstCreateError InstanceFactory::createInstance(BaseInstance *&
 			inst->setIntendedVersionId(version->descriptor());
 			inst->setShouldUseCustomBaseJar(false);
 			break;
-		case MinecraftVersion::OneSix:
-			m_settings->set("InstanceType", "OneSixFTB");
-			inst = new OneSixFTBInstance(instDir, m_settings, this);
+		case MinecraftVersion::Derp:
+			m_settings->set("InstanceType", "DerpFTB");
+			inst = new DerpFTBInstance(instDir, m_settings, this);
 			inst->setIntendedVersionId(version->descriptor());
 			inst->setShouldUseCustomBaseJar(false);
 			break;
@@ -174,8 +176,8 @@ InstanceFactory::InstCreateError InstanceFactory::copyInstance(BaseInstance *&ne
 	m_settings->registerSetting("InstanceType", "Legacy");
 	QString inst_type = m_settings->get("InstanceType").toString();
 
-	if(inst_type == "OneSixFTB")
-		m_settings->set("InstanceType", "OneSix");
+	if(inst_type == "OneSixFTB" || inst_type == "DerpFTB")
+		m_settings->set("InstanceType", "Derp");
 	if(inst_type == "LegacyFTB")
 		m_settings->set("InstanceType", "Legacy");
 
diff --git a/logic/LegacyInstance.h b/logic/LegacyInstance.h
index 1e7d9eb6..1ff17cbd 100644
--- a/logic/LegacyInstance.h
+++ b/logic/LegacyInstance.h
@@ -68,7 +68,7 @@ public:
 	virtual QString intendedVersionId() const override;
 	virtual bool setIntendedVersionId(QString version) override;
 	// the `version' of Legacy instances is defined by the launcher code.
-	// in contrast with OneSix, where `version' is described in a json file
+	// in contrast with Derp, where `version' is described in a json file
 	virtual bool versionIsCustom() override
 	{
 		return false;
diff --git a/logic/LiteLoaderInstaller.cpp b/logic/LiteLoaderInstaller.cpp
index 07fffff3..8a120eab 100644
--- a/logic/LiteLoaderInstaller.cpp
+++ b/logic/LiteLoaderInstaller.cpp
@@ -15,8 +15,8 @@
 
 #include "LiteLoaderInstaller.h"
 
-#include "OneSixVersion.h"
-#include "OneSixLibrary.h"
+#include "DerpVersion.h"
+#include "DerpLibrary.h"
 
 QMap<QString, QString> LiteLoaderInstaller::m_launcherWrapperVersionMapping;
 
@@ -36,9 +36,9 @@ bool LiteLoaderInstaller::canApply() const
 	return m_launcherWrapperVersionMapping.contains(m_mcVersion);
 }
 
-bool LiteLoaderInstaller::apply(std::shared_ptr<OneSixVersion> to)
+bool LiteLoaderInstaller::apply(std::shared_ptr<DerpVersion> to)
 {
-	to->externalUpdateStart();
+	// DERPFIX
 
 	applyLaunchwrapper(to);
 	applyLiteLoader(to);
@@ -51,15 +51,14 @@ bool LiteLoaderInstaller::apply(std::shared_ptr<OneSixVersion> to)
 			" --tweakClass com.mumfrey.liteloader.launch.LiteLoaderTweaker");
 	}
 
-	to->externalUpdateFinish();
-	return to->toOriginalFile();
+	return true;
 }
 
-void LiteLoaderInstaller::applyLaunchwrapper(std::shared_ptr<OneSixVersion> to)
+void LiteLoaderInstaller::applyLaunchwrapper(std::shared_ptr<DerpVersion> to)
 {
 	const QString intendedVersion = m_launcherWrapperVersionMapping[m_mcVersion];
 
-	QMutableListIterator<std::shared_ptr<OneSixLibrary>> it(to->libraries);
+	QMutableListIterator<std::shared_ptr<DerpLibrary>> it(to->libraries);
 	while (it.hasNext())
 	{
 		it.next();
@@ -76,15 +75,15 @@ void LiteLoaderInstaller::applyLaunchwrapper(std::shared_ptr<OneSixVersion> to)
 		}
 	}
 
-	std::shared_ptr<OneSixLibrary> lib(new OneSixLibrary(
+	std::shared_ptr<DerpLibrary> lib(new DerpLibrary(
 		"net.minecraft:launchwrapper:" + m_launcherWrapperVersionMapping[m_mcVersion]));
 	lib->finalize();
 	to->libraries.prepend(lib);
 }
 
-void LiteLoaderInstaller::applyLiteLoader(std::shared_ptr<OneSixVersion> to)
+void LiteLoaderInstaller::applyLiteLoader(std::shared_ptr<DerpVersion> to)
 {
-	QMutableListIterator<std::shared_ptr<OneSixLibrary>> it(to->libraries);
+	QMutableListIterator<std::shared_ptr<DerpLibrary>> it(to->libraries);
 	while (it.hasNext())
 	{
 		it.next();
@@ -94,8 +93,8 @@ void LiteLoaderInstaller::applyLiteLoader(std::shared_ptr<OneSixVersion> to)
 		}
 	}
 
-	std::shared_ptr<OneSixLibrary> lib(
-		new OneSixLibrary("com.mumfrey:liteloader:" + m_mcVersion));
+	std::shared_ptr<DerpLibrary> lib(
+		new DerpLibrary("com.mumfrey:liteloader:" + m_mcVersion));
 	lib->setBaseUrl("http://dl.liteloader.com/versions/");
 	lib->finalize();
 	to->libraries.prepend(lib);
diff --git a/logic/LiteLoaderInstaller.h b/logic/LiteLoaderInstaller.h
index 44b306d6..d7b8ce77 100644
--- a/logic/LiteLoaderInstaller.h
+++ b/logic/LiteLoaderInstaller.h
@@ -18,7 +18,7 @@
 #include <QMap>
 #include <memory>
 
-class OneSixVersion;
+class DerpVersion;
 
 class LiteLoaderInstaller
 {
@@ -27,13 +27,13 @@ public:
 
 	bool canApply() const;
 
-	bool apply(std::shared_ptr<OneSixVersion> to);
+	bool apply(std::shared_ptr<DerpVersion> to);
 
 private:
 	QString m_mcVersion;
 
-	void applyLaunchwrapper(std::shared_ptr<OneSixVersion> to);
-	void applyLiteLoader(std::shared_ptr<OneSixVersion> to);
+	void applyLaunchwrapper(std::shared_ptr<DerpVersion> to);
+	void applyLiteLoader(std::shared_ptr<DerpVersion> to);
 
 	static QMap<QString, QString> m_launcherWrapperVersionMapping;
 };
diff --git a/logic/MinecraftVersion.h b/logic/MinecraftVersion.h
index 504381a8..dd849ce9 100644
--- a/logic/MinecraftVersion.h
+++ b/logic/MinecraftVersion.h
@@ -32,7 +32,7 @@ struct MinecraftVersion : public BaseVersion
 	/// This version's type. Used internally to identify what kind of version this is.
 	enum VersionType
 	{
-		OneSix,
+		Derp,
 		Legacy,
 		Nostalgia
 	} type;
@@ -66,8 +66,8 @@ struct MinecraftVersion : public BaseVersion
 		}
 		switch (type)
 		{
-		case OneSix:
-			pre_final.append("OneSix");
+		case Derp:
+			pre_final.append("Derp");
 			break;
 		case Legacy:
 			pre_final.append("Legacy");
diff --git a/logic/NostalgiaInstance.cpp b/logic/NostalgiaInstance.cpp
index 2e23ee71..f27954a7 100644
--- a/logic/NostalgiaInstance.cpp
+++ b/logic/NostalgiaInstance.cpp
@@ -17,7 +17,7 @@
 
 NostalgiaInstance::NostalgiaInstance(const QString &rootDir, SettingsObject *settings,
 									 QObject *parent)
-	: OneSixInstance(rootDir, settings, parent)
+	: DerpInstance(rootDir, settings, parent)
 {
 }
 
diff --git a/logic/NostalgiaInstance.h b/logic/NostalgiaInstance.h
index a26f7f0a..6a6b91a1 100644
--- a/logic/NostalgiaInstance.h
+++ b/logic/NostalgiaInstance.h
@@ -15,9 +15,9 @@
 
 #pragma once
 
-#include "OneSixInstance.h"
+#include "DerpInstance.h"
 
-class NostalgiaInstance : public OneSixInstance
+class NostalgiaInstance : public DerpInstance
 {
 	Q_OBJECT
 public:
diff --git a/logic/OneSixVersion.cpp b/logic/OneSixVersion.cpp
index 8ae685f0..3571be9b 100644
--- a/logic/OneSixVersion.cpp
+++ b/logic/OneSixVersion.cpp
@@ -13,14 +13,14 @@
  * limitations under the License.
  */
 
-#include "logic/OneSixVersion.h"
-#include "logic/OneSixLibrary.h"
-#include "logic/OneSixRule.h"
+#include "logic/DerpVersion.h"
+#include "logic/DerpLibrary.h"
+#include "logic/DerpRule.h"
 
 #include "logger/QsLog.h"
 
-std::shared_ptr<OneSixVersion> fromJsonV4(QJsonObject root,
-										  std::shared_ptr<OneSixVersion> fullVersion)
+std::shared_ptr<DerpVersion> fromJsonV4(QJsonObject root,
+										  std::shared_ptr<DerpVersion> fullVersion)
 {
 	fullVersion->id = root.value("id").toString();
 
@@ -93,7 +93,7 @@ std::shared_ptr<OneSixVersion> fromJsonV4(QJsonObject root,
 		auto nameVal = libObj.value("name");
 		if (!nameVal.isString())
 			continue;
-		std::shared_ptr<OneSixLibrary> library(new OneSixLibrary(nameVal.toString()));
+		std::shared_ptr<DerpLibrary> library(new DerpLibrary(nameVal.toString()));
 
 		auto urlVal = libObj.value("url");
 		if (urlVal.isString())
@@ -158,9 +158,9 @@ std::shared_ptr<OneSixVersion> fromJsonV4(QJsonObject root,
 	return fullVersion;
 }
 
-std::shared_ptr<OneSixVersion> OneSixVersion::fromJson(QJsonObject root)
+std::shared_ptr<DerpVersion> DerpVersion::fromJson(QJsonObject root)
 {
-	std::shared_ptr<OneSixVersion> readVersion(new OneSixVersion());
+	std::shared_ptr<DerpVersion> readVersion(new DerpVersion());
 	int launcher_ver = readVersion->minimumLauncherVersion =
 		root.value("minimumLauncherVersion").toDouble();
 
@@ -169,16 +169,16 @@ std::shared_ptr<OneSixVersion> OneSixVersion::fromJson(QJsonObject root)
 		return fromJsonV4(root, readVersion);
 	else
 	{
-		return std::shared_ptr<OneSixVersion>();
+		return std::shared_ptr<DerpVersion>();
 	}
 }
 
-std::shared_ptr<OneSixVersion> OneSixVersion::fromFile(QString filepath)
+std::shared_ptr<DerpVersion> DerpVersion::fromFile(QString filepath)
 {
 	QFile file(filepath);
 	if (!file.open(QIODevice::ReadOnly))
 	{
-		return std::shared_ptr<OneSixVersion>();
+		return std::shared_ptr<DerpVersion>();
 	}
 
 	auto data = file.readAll();
@@ -187,12 +187,12 @@ std::shared_ptr<OneSixVersion> OneSixVersion::fromFile(QString filepath)
 
 	if (jsonError.error != QJsonParseError::NoError)
 	{
-		return std::shared_ptr<OneSixVersion>();
+		return std::shared_ptr<DerpVersion>();
 	}
 
 	if (!jsonDoc.isObject())
 	{
-		return std::shared_ptr<OneSixVersion>();
+		return std::shared_ptr<DerpVersion>();
 	}
 	QJsonObject root = jsonDoc.object();
 	auto version = fromJson(root);
@@ -201,7 +201,7 @@ std::shared_ptr<OneSixVersion> OneSixVersion::fromFile(QString filepath)
 	return version;
 }
 
-bool OneSixVersion::toOriginalFile()
+bool DerpVersion::toOriginalFile()
 {
 	if (original_file.isEmpty())
 		return false;
@@ -232,9 +232,9 @@ bool OneSixVersion::toOriginalFile()
 	return file.commit();
 }
 
-QList<std::shared_ptr<OneSixLibrary>> OneSixVersion::getActiveNormalLibs()
+QList<std::shared_ptr<DerpLibrary>> DerpVersion::getActiveNormalLibs()
 {
-	QList<std::shared_ptr<OneSixLibrary>> output;
+	QList<std::shared_ptr<DerpLibrary>> output;
 	for (auto lib : libraries)
 	{
 		if (lib->isActive() && !lib->isNative())
@@ -245,9 +245,9 @@ QList<std::shared_ptr<OneSixLibrary>> OneSixVersion::getActiveNormalLibs()
 	return output;
 }
 
-QList<std::shared_ptr<OneSixLibrary>> OneSixVersion::getActiveNativeLibs()
+QList<std::shared_ptr<DerpLibrary>> DerpVersion::getActiveNativeLibs()
 {
-	QList<std::shared_ptr<OneSixLibrary>> output;
+	QList<std::shared_ptr<DerpLibrary>> output;
 	for (auto lib : libraries)
 	{
 		if (lib->isActive() && lib->isNative())
@@ -258,17 +258,17 @@ QList<std::shared_ptr<OneSixLibrary>> OneSixVersion::getActiveNativeLibs()
 	return output;
 }
 
-void OneSixVersion::externalUpdateStart()
+void DerpVersion::externalUpdateStart()
 {
 	beginResetModel();
 }
 
-void OneSixVersion::externalUpdateFinish()
+void DerpVersion::externalUpdateFinish()
 {
 	endResetModel();
 }
 
-QVariant OneSixVersion::data(const QModelIndex &index, int role) const
+QVariant DerpVersion::data(const QModelIndex &index, int role) const
 {
 	if (!index.isValid())
 		return QVariant();
@@ -296,7 +296,7 @@ QVariant OneSixVersion::data(const QModelIndex &index, int role) const
 	return QVariant();
 }
 
-Qt::ItemFlags OneSixVersion::flags(const QModelIndex &index) const
+Qt::ItemFlags DerpVersion::flags(const QModelIndex &index) const
 {
 	if (!index.isValid())
 		return Qt::NoItemFlags;
@@ -312,7 +312,7 @@ Qt::ItemFlags OneSixVersion::flags(const QModelIndex &index) const
 	// return QAbstractListModel::flags(index);
 }
 
-QVariant OneSixVersion::headerData(int section, Qt::Orientation orientation, int role) const
+QVariant DerpVersion::headerData(int section, Qt::Orientation orientation, int role) const
 {
 	if (role != Qt::DisplayRole || orientation != Qt::Horizontal)
 		return QVariant();
@@ -329,12 +329,12 @@ QVariant OneSixVersion::headerData(int section, Qt::Orientation orientation, int
 	}
 }
 
-int OneSixVersion::rowCount(const QModelIndex &parent) const
+int DerpVersion::rowCount(const QModelIndex &parent) const
 {
 	return libraries.size();
 }
 
-int OneSixVersion::columnCount(const QModelIndex &parent) const
+int DerpVersion::columnCount(const QModelIndex &parent) const
 {
 	return 3;
 }
diff --git a/logic/OneSixVersion.h b/logic/OneSixVersion.h
index 036f3d53..e8f744aa 100644
--- a/logic/OneSixVersion.h
+++ b/logic/OneSixVersion.h
@@ -17,9 +17,9 @@
 #include <QtCore>
 #include <memory>
 
-class OneSixLibrary;
+class DerpLibrary;
 
-class OneSixVersion : public QAbstractListModel
+class DerpVersion : public QAbstractListModel
 {
 	// Things required to implement the Qt list model
 public:
@@ -33,12 +33,12 @@ public:
 	// serialization/deserialization
 public:
 	bool toOriginalFile();
-	static std::shared_ptr<OneSixVersion> fromJson(QJsonObject root);
-	static std::shared_ptr<OneSixVersion> fromFile(QString filepath);
+	static std::shared_ptr<DerpVersion> fromJson(QJsonObject root);
+	static std::shared_ptr<DerpVersion> fromFile(QString filepath);
 
 public:
-	QList<std::shared_ptr<OneSixLibrary>> getActiveNormalLibs();
-	QList<std::shared_ptr<OneSixLibrary>> getActiveNativeLibs();
+	QList<std::shared_ptr<DerpLibrary>> getActiveNormalLibs();
+	QList<std::shared_ptr<DerpLibrary>> getActiveNativeLibs();
 	// called when something starts/stops messing with the object
 	// FIXME: these are ugly in every possible way.
 	void externalUpdateStart();
@@ -81,7 +81,7 @@ public:
 	QString mainClass;
 
 	/// the list of libs - both active and inactive, native and java
-	QList<std::shared_ptr<OneSixLibrary>> libraries;
+	QList<std::shared_ptr<DerpLibrary>> libraries;
 
 	/*
 	FIXME: add support for those rules here? Looks like a pile of quick hacks to me though.
diff --git a/logic/lists/MinecraftVersionList.cpp b/logic/lists/MinecraftVersionList.cpp
index 91f86df0..29894b5a 100644
--- a/logic/lists/MinecraftVersionList.cpp
+++ b/logic/lists/MinecraftVersionList.cpp
@@ -234,18 +234,18 @@ void MCVListLoadTask::list_downloaded()
 		}
 		// Parse the type.
 		MinecraftVersion::VersionType versionType;
-		// OneSix or Legacy. use filter to determine type
+		// Derp or Legacy. use filter to determine type
 		if (versionTypeStr == "release")
 		{
 			versionType = legacyWhitelist.contains(versionID) ? MinecraftVersion::Legacy
-															  : MinecraftVersion::OneSix;
+															  : MinecraftVersion::Derp;
 			is_latest = (versionID == latestReleaseID);
 			is_snapshot = false;
 		}
 		else if (versionTypeStr == "snapshot") // It's a snapshot... yay
 		{
 			versionType = legacyWhitelist.contains(versionID) ? MinecraftVersion::Legacy
-															  : MinecraftVersion::OneSix;
+															  : MinecraftVersion::Derp;
 			is_latest = (versionID == latestSnapshotID);
 			is_snapshot = true;
 		}