Hi ๐ I'm afraid I can't help you much with that because it's likely not a RenPy problem.
1) Have you downloaded the correct file for your system? Remember, the game is only available for Mac and Windows.
2) Is your system up-to-date? Do you have the latest version of your ZIP program, and is it the right one?
3) Check if your antivirus program is causing this error.
Unfortunately, I can't offer any more help than that ๐ฃ The files are definitely not damaged and work perfectly.