Trying to open the game returns an issue.

Downloaded Yaffaif, then unzipped it, upon trying to open it at first nothing happened.
This on the other hand, is what happened when I tried to assign the Java program to the opening sequence of the game, I’d like to ask for help ^v^’

I’m guessing from that error message that your Java install is broken. Can you try working through the troubleshooting guide and let me know how you get on?