Hi,
I bet you have already tried to:
- “Verify” the Installation on the Epic Games launcher,
- Tried to running them as Adminstrator and
- checked if the “DefaultEngine.ini” file is inside the AppData/Local/UnrealEngine/…/Config folder.
This help is for the Epic Games Launcher and their UE-Games, but maybe it can be reproduced on your system… but installing latest BIOS is something I would not recommend to the normal User:
I hope someone can give you a detailed answer