4.20-GE-1 GloriousEggroll

Used Proton 4.20-GE-1 which can be obtained at https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/4.20-GE-1 With standard Proton up to 4.11-9 the game has to be tweaked to work like described below. To use the GE releases just download the tar.gz and unpack it into:

~/.steam/root/compatibilitytools.d/

If you use the Steam Flatpak release unpack into:

~/.var/app/com.valvesoftware.Steam/.local/share/Steam/compatibilitytools.d

After a Steam reload you can select it in the games properties under "Force the use of a specific Steam Play compatibility tool.