Thank you for getting the game! I'm really happy to hear you enjoyed grown up boy Shiloh and had a good time.
Sadly, that is an issue with Steam. I believe one option is to play the game on a totally different computer or laptop that never had the Itch.io version played on it. If that doesn't work or isn't possible, I'm afraid there might not be anything else that'll work. I'm really sorry for that.