Tbh, I don't really care about a proper Linux version as far as the Windows one works fine with Proton.
I play Rayman 2 [GOG] via Heroic on my Steam Deck.
RCP launches. but whenever I try downloading/installing a mod, I get an error: "Write access is not allowed to the game installation. Try restarting as administrator."
Any way to bypass/fix that? I don't really know if running RCP as admin would be possible.