The good news is that if you're on Fedora or Arch, it still works fine on Proton.

The way I ran it was that first, I used Wine to install the Windows installer, then I went to my Wine directory (/home/[username]/.wine/drive_c/Program Files/alterorb/) and added alterorb.exe as a non-Steam game.

Then, I switched to Proton 11 in the compatibility tab. Works like a charm!