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diff --git a/archived/projt-launcher/launcher/BaseInstaller.h b/archived/projt-launcher/launcher/BaseInstaller.h
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+// SPDX-License-Identifier: GPL-3.0-only AND Apache-2.0
+// SPDX-FileCopyrightText: 2026 Project Tick
+// SPDX-FileContributor: Project Tick Team
+/*
+ *  ProjT Launcher - Minecraft Launcher
+ *  Copyright (C) 2026 Project Tick
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, write to the Free Software Foundation,
+ *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * === Upstream License Block (Do Not Modify) ==============================
+ * Copyright 2013-2021 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 <memory>
+
+#include "BaseVersion.h"
+
+class MinecraftInstance;
+class QDir;
+class QString;
+class QObject;
+class Task;
+class BaseVersion;
+
+class BaseInstaller
+{
+  public:
+	BaseInstaller();
+	virtual ~BaseInstaller() {};
+	bool isApplied(MinecraftInstance* on);
+
+	virtual bool add(MinecraftInstance* to);
+	virtual bool remove(MinecraftInstance* from);
+
+	virtual Task* createInstallTask(MinecraftInstance* instance, BaseVersion::Ptr version, QObject* parent) = 0;
+
+  protected:
+	virtual QString id() const = 0;
+	QString filename(const QString& root) const;
+	QDir patchesDir(const QString& root) const;
+};