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

mainwindow.cpp

@@ -2,10 +2,14 @@
 #include "./ui_mainwindow.h"
 
 #include <QCloseEvent>
+#include <QMessageBox>
 
 #include "data/settingshandler.h"
 #include "genericcore.h"
 
+static QString updateTextClean = "Do you want to update the application now?";
+static QString updateTextDirty = "Do you want to save the tasks & update the application now?";
+
 MainWindow::MainWindow(QWidget* parent)
     : QMainWindow(parent)
     , ui(new Ui::MainWindow) {
@@ -32,6 +36,8 @@ MainWindow::MainWindow(QWidget* parent)
 
   connect(m_core, &GenericCore::displayStatusMessage, this, &MainWindow::displayStatusMessage);
   connect(this, &MainWindow::displayStatusMessage, this, &MainWindow::showStatusMessage);
+  connect(this, &MainWindow::checkForUpdates, this,
+          &MainWindow::on_actionCheck_for_update_triggered, Qt::QueuedConnection);
 }
 
 MainWindow::~MainWindow() {
@@ -49,6 +55,20 @@ void MainWindow::showStatusMessage(const QString text) {
   ui->statusbar->showMessage(text);
 }
 
+void MainWindow::on_actionCheck_for_update_triggered() {
+  showStatusMessage("Checking for update...");
+  const bool updateAvailable = m_core->isApplicationUpdateAvailable();
+  if (updateAvailable) {
+    const QString text = isWindowModified() ? updateTextDirty : updateTextClean;
+    const QMessageBox::StandardButton clickedButton = QMessageBox::question(
+        this, tr("Update available."), text, QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
+    if (clickedButton == QMessageBox::Yes) {
+      m_core->triggerApplicationUpdate();
+      close();
+    }
+  }
+}
+
 void MainWindow::closeEvent(QCloseEvent* event) {
   if (isWindowModified()) {
     QMessageBox msgBox;