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diff --git a/meshmc/launcher/ui/dialogs/UpdateDialog.h b/meshmc/launcher/ui/dialogs/UpdateDialog.h
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+++ b/meshmc/launcher/ui/dialogs/UpdateDialog.h
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+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   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, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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, see <https://www.gnu.org/licenses/>.
+ *
+ *  This file incorporates work covered by the following copyright and
+ *  permission notice:
+ *
+ * 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 <QDialog>
+#include "updater/UpdateChecker.h"
+
+namespace Ui
+{
+	class UpdateDialog;
+}
+
+enum UpdateAction {
+	UPDATE_LATER = QDialog::Rejected,
+	UPDATE_NOW = QDialog::Accepted,
+};
+
+class UpdateDialog : public QDialog
+{
+	Q_OBJECT
+
+  public:
+	/*!
+	 * Constructs the update dialog.
+	 * \a hasUpdate    - true when an update is available (shows "Update now"
+	 * button).
+	 * \a status       - update information (version, release notes); ignored
+	 * when hasUpdate is false.
+	 */
+	explicit UpdateDialog(bool hasUpdate,
+						  const UpdateAvailableStatus& status = {},
+						  QWidget* parent = nullptr);
+	~UpdateDialog();
+
+  public slots:
+	void on_btnUpdateNow_clicked();
+	void on_btnUpdateLater_clicked();
+
+  protected:
+	void closeEvent(QCloseEvent*) override;
+
+  private:
+	Ui::UpdateDialog* ui;
+};