@Tusharh If you want the value of the registry entry "TaskCache" you should use QSettings::value(QString key) QObject::property(QString name) gives you the property of your QSettings object

@GoranShekerov Tried the above code to stop and remove the windows service while uninstalling from QT installer. But did not work function Controller() { installer.uninstallationStarted.connect(onUninstallationStarted); } onUninstallationStarted = function() { if (installer.isUninstaller()) { installer.performOperation("Execute", "@TargetDir@/platform/tools/Server/testServer.exe", "stop"); console.log("Server stopped") installer.performOperation("Execute", "@TargetDir@/platform/tools/Server/testServer.exe", "remove"); console.log("Server removed") } }