Yeah! But it looks like you'll get to the email only once you contact Itch.io with your problem about the game. Let me think about this before I wildly post email addresses in comments...
In the meantime:
If you are on Windows, you need to download the appropriate zip-file, unpack it (there should be an option to do so when you right-click the zip-file) and once that's done, double-click on the exe-file.
The same should work for the Linux distribution.
I hope you don't mind this generic advise, but I am not sure what exactly your issue is so I start by covering the basics. ;-)
Regards, Windy