Thanks @MakingAccountsIsFun
Can you please try the following -
- Go to the Launcher folder in the Vermintide 2 directory
\SteamLibrary\steamapps\common\Warhammer Vermintide 2\launcher
- Create a text file named steam_appid.txt with 552500 inside
- Right-click on launcher.exe and select ‘Properties’
- In ‘Compatability’, disable the ‘Run as Administrator’ checkbox and select OK
- Try launching Vermintide 2
Please let me know how this goes.