What is Proton?
Proton is a new tool released by Valve that is integrated into Steam makes the Games and Windows programs compatible with the Endless OS
1) Recommended have Endless OS 3.5 or higher
(To check which version of Endless OS you are in Settings 
Details)
2) Open Steam
3) Go to Settings Steam Play
4) Mark Enable Steam Play for supported titles
5) Click OK
6) Click Restart Steam
