Seeing exact same issue here as well on M1 Max using Ventura 13.4.1, trying to install update 1.0.2. I have files a bug report using the official link they give inside the toolkit at http://feedbackssistnt.apple.com as it actually has an entry for the game porting toolkit. However, I don’t know if that will get any faster response on the issue. There doesn’t seem to be defacto standard way in uninstalling the toolkit however I game it a try by removing brew, and the searching for anything with game porting toolkit related files and directories, being careful,to avoid removing any brew stuff related to the default install with the os. after spending 2 full days on trying to fix this, I guess I’m in a holding pattern with everyone else until teh fix or new version comes out that rememwdies this. In the meantime, zero m1 gaming.