unreal engine does not start

unreal engine does not startlink text

non of those logs are from the UE4Editor.exe. The logs show the launcher launching the editor, and then closing.

go to your Kwak-PC

look under EpicPortal/SAved/Logs

or

C:/Program Files (x86)/Epic Games/4.12/Engine/saved/logs

or

the new location that the newer version was installed to,