Hi!
I just tried it out and can download the ZIP with all Data. Unzipping and starting the game works as well.
Maybe the itch.io server had problems or your internet connection was unstable.
If the error still occurs
- What Operation System (OS) (Windows 7, 10, XP) do you have?
- Can you download other files from itch.io?
- Can you download other files from other websites?