After launch, the game shows a black screen and then crashed.
Just launch the game.
+1 for support on this game. As far as I know it's only a matter of the EAC (Easy Anti Cheat)-System not working correctly through wine/proton.
tried the "trick" that worked with Squad (https://github.com/ValveSoftware/Proton/issues/938#issuecomment-655405271) - but no luck - game refuses to start when I set C:\\users\\steamuser\\Temp to read only (that helped with SQAD) and if I don't do it I get the same "Cannot create game client" EAC message. But I don't really know what exactly it does so maybe it can be adapted for HLL by someone smarter - like @imaami (original poster on squad issue)
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+1 for support on this game. As far as I know it's only a matter of the EAC (Easy Anti Cheat)-System not working correctly through wine/proton.