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diff --git a/api/logic/minecraft/legacy/LegacyInstance.h b/api/logic/minecraft/legacy/LegacyInstance.h
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+++ b/api/logic/minecraft/legacy/LegacyInstance.h
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+/* Copyright 2013-2017 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 "BaseInstance.h"
+#include "minecraft/Mod.h"
+
+#include "multimc_logic_export.h"
+
+class ModList;
+class LegacyModList;
+class Task;
+/*
+ * WHY: Legacy instances - from MultiMC 3 and 4 - are here only to provide a way to upgrade them to the current format.
+ */
+class MULTIMC_LOGIC_EXPORT LegacyInstance : public BaseInstance
+{
+	Q_OBJECT
+public:
+
+	explicit LegacyInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir);
+
+	virtual void init() override {};
+
+	/// Path to the instance's minecraft.jar
+	QString runnableJar() const;
+
+	//! Path to the instance's modlist file.
+	QString modListFile() const;
+
+	////// Directories //////
+	QString libDir() const;
+	QString savesDir() const;
+	QString texturePacksDir() const;
+	QString jarModsDir() const;
+	QString loaderModsDir() const;
+	QString coreModsDir() const;
+	QString resourceDir() const;
+	virtual QString instanceConfigFolder() const override;
+	QString minecraftRoot() const; // Path to the instance's minecraft directory.
+	QString binRoot() const; // Path to the instance's minecraft bin directory.
+
+	/// Get the curent base jar of this instance. By default, it's the
+	/// versions/$version/$version.jar
+	QString baseJar() const;
+
+	/// the default base jar of this instance
+	QString defaultBaseJar() const;
+	/// the default custom base jar of this instance
+	QString defaultCustomBaseJar() const;
+
+	/*!
+	 * Whether or not custom base jar is used
+	 */
+	bool shouldUseCustomBaseJar() const;
+
+	/*!
+	 * The value of the custom base jar
+	 */
+	QString customBaseJar() const;
+
+	std::shared_ptr<LegacyModList> jarModList() const;
+	QList<Mod> getJarMods() const;
+
+	/*!
+	 * Whether or not the instance's minecraft.jar needs to be rebuilt.
+	 * If this is true, when the instance launches, its jar mods will be
+	 * re-added to a fresh minecraft.jar file.
+	 */
+	bool shouldRebuild() const;
+
+	QString currentVersionId() const;
+	QString intendedVersionId() const;
+
+	QSet<QString> traits() override
+	{
+		return {"legacy-instance", "texturepacks"};
+	};
+
+	virtual bool shouldUpdate() const;
+	virtual shared_qobject_ptr<Task> createUpdateTask() override;
+
+	virtual QString typeName() const override;
+
+	bool canExport() const override
+	{
+		return false;
+	}
+	std::shared_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account) override
+	{
+		return nullptr;
+	}
+	IPathMatcher::Ptr getLogFileMatcher() override
+	{
+		return nullptr;
+	}
+	QString getLogFileRoot() override
+	{
+		return minecraftRoot();
+	}
+
+	QString getStatusbarDescription() override;
+	QStringList verboseDescription(AuthSessionPtr session) override;
+
+	QProcessEnvironment createEnvironment() override
+	{
+		return QProcessEnvironment();
+	}
+	QMap<QString, QString> getVariables() const override
+	{
+		return {};
+	}
+protected:
+	mutable std::shared_ptr<LegacyModList> jar_mod_list;
+};