Hi audinobutt, I would suggest re-downloading to see if it fixes the issue as it might have been a problem with the download process. If that doesn't work, you can try using 7zip or your operating system's native extracting function (I'm assuming you are on Windows as I'm unaware if jZip runs on Mac or Linux. I think Windows 7 SP1 and higher should have this function). If your issue persists, you can also download and install the game through the itch.io app. Let me know if this resolves your issue!