It's weird that button wouldn't work. Have you tried changing the installation path? Maybe that would help.
Click the button with the three dots to the right of the filepath (the string of text that starts with "C:/" or "C¥" in this case), and it should take you to a box where you can select where you want the game installed. If that doesn't work, you can try extracting the game files (in Yummy Breakfast.lzh) with a program like 7zip, if you have it. I hope this helps!