I can't remember exactly where it was, but part of the missing 8gb were python resource files installed for the AI to run.
You're gonna wanna pick up this program:
https://www.jam-software.com/treesize_free
called TreeSize Free. It essentially just looks at your file system and shows you what folders are taking up space. You'll see your largest folder (maybe steam/common/steamapps) at the top, and then the next largest folder in your file system, and the next, and so on. If you see anything you don't recognize, or see something relating to python's resource files, then you've found the folder that I found. You might want to google the filenames of some stuff to see if its important or if it can be deleted safely.
I actually ran the GodAi install again to look at the items listed in the install and see if I could find them, which you may want to do as well. There could be files that it installed for you that I may have already had installed on my pc, so your missing space could be completely different from mine if, say, you already have python resources on your pc, but not some other resources that are included in the installer.
Still can't figure out how to delete postgres folder under users.