2 points
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According to the archlinux wiki:
“If you are trying to run a native game using Proton but get a Steam compatibility tool error immediately after starting the game, you might have to reinstall the runtime.
- Navigate to your Steam library.
- In the dropdown above your game list check the Tools option to make them visible.
- Search for Proton, right click on each installed tool, visit Properties, open the Local files tab and click Verify integrity of tool files for each entry.
- Search for Steam Linux Runtime and repeat the same procedure. If none are available, install the latest Steam Linux Runtime - Soldier.”
Link: https://wiki.archlinux.org/title/Steam/Troubleshooting
