gm286: Unless it's because I'm now running on the Catalina interface; I can't see the option to buy the game as macOS. I only see the Windows and Linux options. Planning on dual-booting my Mac so that in the future I can run games like these through Mojave.
The game comes with a Mac installer. You don't need to choose an OS when you buy the game. You will be able to download the installers for all three operative systems.
https://www.gog.com/upload/forum/2020/04/28ce6b78b1f50c128fd7d5f97586a3a0e05a5d41.jpg Note, however, that Catalina won't run this game as it is 32-bit. You will have to use an earlier version. From the game page:
Mac notice: The game is 32-bit only and will not work on macOS 10.15 and up.