Thanks a lot! Really glad you liked it :)
It's to unlock the downloadable Bonus.zip
You're probably gonna need WinRar if you're on Windows or ZArchiver if you're on Android
I'm not quite sure what WinRar is, but your probably right about me needing it. Since it won't seem to let down me extract the folder.
Thank you very much for the answer!
It's a program used to compress and extract files, much better than the stock Windows stuff. Also you're welcome! Glad to help :)