Hello @superSTA101, we're tracking issues with games run with Proton in the Proton issue tracker. Additionally, we're using one issue report per unofficially supported game title (running CS:GO with Proton is not officially supported), so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/2704#issuecomment-1219664992.
Distro: EndeavourOS (based on arch)
CS:GO won't launch via proton and replies with a error message (attachment).
Yes i have everything up to date.