Make a Voices of the Void folder and extract your game there. Open your Steam app, select "Games" at the top, "add a non-steam game to my library", "Browse", find and select "VotV.exe" on your computer - where you extracted game files, "add selected program", VotV.exe should appear in your games library on the left, now right mouse click on it, "properties", select compatability tool, choose proton experimental. Done.