Available update can be checked via menu action Help/"Check for update".

mainwindow.h

@@ -21,14 +21,17 @@ class MainWindow : public QMainWindow {
 
  signals:
   void displayStatusMessage(QString message);
+  void checkForUpdates();
 
  protected:
   void closeEvent(QCloseEvent* event) override;
 
  private slots:
-  void on_pushButton_clicked();
-
   void showStatusMessage(const QString text);
+
+  void on_pushButton_clicked();
+  void on_actionCheck_for_update_triggered();
+
  private:
   Ui::MainWindow* ui;