Hello, here a short update. Because in my notebook UE 4 crashed with a crash-report (with my PC UE4 and Windows 10 crashed without any crash-report) I had deinstalled and reinstalled UE 4.23.1 (with all options, see the post above this from Luos, her a many thanks to him). Also I have deleted the last update from Windows 10 an reupdated it. And what I say. This day no crash with UE4. I will try this tomorrow with my PC. I hope UE4 runs on my PC too. I will report it in a few days. Greetings from a newby 