After updating my MacBook Pro to Mac OS Sonoma, I've tried to install Apple's Game Porting Toolkit (GPTK).
I've followed the AppleGamingWiki guide.
Unfortunately, after installing + starting Steam using these 2 commands, I get the error as shown below:
# Install gameportingtoolkit ~/my-game-prefix ~/Downloads/SteamSetup.exe # Run gameportingtoolkit ~/my-game-prefix 'C:\Program Files (x86)\Steam\steam.exe'
Somebody else suggested to copy the
userdata files from the MacOs Steam to the Windows variant, again, the same error occurs.
Another suggestion that didn't work was to launch Steam using these arguments:
Does somebody know how to resolve this issue?