I happily ran THUGPRO under wine, so I assume rethawed would be the same. Dunno.

Where am I even supposed to buy it if I wanted to, which I don’t really,

Looks like it’s abandonware. Yeah, publisher dropped the ball.

Might be worth checking out ReThawed.. You can choose the physics models, UI, characters, tricks and maps from all of the old THPS games.

I tried THUGPRO previously (another community mod in similar vein) and it was fun, especially the mods to the park editor (overlapping objects!) and Sonic Adventure maps.