I just bought it on Steam under Linux and it won't install due to "unsupported platform", so I guess it's currently not working with Proton :(
EDIT: never mind! I forgot to check the "force the use of a specific Steam Play compatibility tool" in Settings -> Compatibility. With that checked (Proton 8.0.2) it installed and launched just fine (after launching the "repair easy anti-cheat" once)!
EDIT: never mind! I forgot to check the "force the use of a specific Steam Play compatibility tool" in Settings -> Compatibility. With that checked (Proton 8.0.2) it installed and launched just fine (after launching the "repair easy anti-cheat" once)!