PSA - If your Steam Deck or Steam on Linux has started failing to download or launch Proton games, you may have caught a bad config from Valve's servers.

We believe the problem is fixed now, but you need to delete a cache file locally (`~/.steam/steam/userdata/<steamid>/config/compat.vdf` where <steamid> is your id).

See https://github.com/ValveSoftware/steam-for-linux/issues/10846 for details.

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Proton 9.0 No Longer Available to Install · Issue #10846 · ValveSoftware/steam-for-linux

Hello, A few hours ago, every game started hanging on a "Downloading Content" screen without ever attempting to launch: After some investigating, I discovered that Proton 9.0 is no longer installed...

^GitHub