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This tutorial might apply to other HvH depots. Install Lutris and wine-ge from the package manager of your choice. Open Lutris, press the "+" button in the upper-left corner, select "Search the Lutris website for installers" and search for "Steam". Scroll until you find Steam (2003, Windows)...

so u use linux? want to play 2018 hvh? ur in good hands (i think) first of all you want to get 2018 csgo downloaded and add it to steam as a non steam game: after this find where you got your 2018 csgo and add 'csgo.exe' as a non steam game NOW you want to run it at least once via proton...