If you haven't yet, you may wish to try updating the runners Bottles uses. You can get ProtonUp Qt or ProtonPlus from the software store to do this, and there's a howto in the gaming section covering use. [How To] Install Custom Proton-GE in Steam. By selecting Bottles instead of Steam as the target (in either program), you can update Bottles' runners, which may make PotPlayer work (or may not). Remember to close Bottles before updating its runners, and remember to set the new runner on any bottle you're using; by default it sticks to the runner with which it was created.
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