Maybe try hitting the "check for updates" button? Or right-click the game name and hit "Repair"? This sounds like an issue with itch. What OS are you on?
I just tried both of those to no avail. I don't know if this means anything to you but I looked at the file more closely, aka I went to Properties>Security>Advanced, and it says "Owner: Unable to display current owner." I also went ahead and submitted this problem to itchio's compatibility watchlist. Which is located at: https://github.com/itchio/itch-compatibility-watchlist
Oh, and my OS is Windows 10.