Hi,
After updating to 4.8.3 few days ago I can´t start the launcher anymore, it crashes.
I already sent the bug report.
I can start my projects with the uproject files in my project folders and they run just fine,
but the launcher is broken. I didn´t change anything else (driver) exept the update of the launcher.
Since then it doesn´t work anymore.
I attached a zipped log-folder I created through the “-debuglogging” command.
Hope somebody can help.
Thanks in advancelink text
Hi DIO_666,
This looks to be fallout of a bug that occurred some time ago. It looks as though in your local vault data cache you have a folder for “UE_4.4”. This should not be there, and I believe removing it will fix your problem.
You can find this here:
C:\Program Files\Unreal Engine\Launcher\VaultCache\UE_4.4
Deleting the folder solved the problem.
Thank you very much for the quick help 
Great support!
On my Mac, I simply renamed “VaultCache” at: /Users/Shared/UnrealEngine/Launcher/VaultCache
>pwd
/Users/Shared/UnrealEngine/Launcher
>mv VaultCache VaultCacheOld
I didn’t have the above folder, but I had version 4.3 folders.