Would you try uninstalling the game? After doing so, would you check both your steam directory and your documents folder and make sure that anything related to the game has been deleted from both folders. Lastly would you check your user folder for a (possibly hidden) folder. The directory should look something like this:
C:\Users\Me (or whatever your username on your pc is)\AppData\Roaming\Out of the Park Developments. Once you're in that folder, then delete the entire OOTP Baseball 20 folder.
After you do all this then restart your pc and try re-installing the game.
Let me know if that helps. If not let me know and we'll go through some other steps to try to get this resolved.
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