Greetings to you!
I hope you are doing well.
I am sorry to know about this error “Unknown file version” that you are facing.
This error in particular can be sorted by a simply game files verification through steam. Kindly try this, using the link - Steam Support :: Verify Integrity of Game Files
If it doesn’t get resolved, then try to completely uninstall and reinstall the game.
A PC restart might be required in both cases.
Let me know!
Thank you Verifying files fixed the issue
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