Need help with Unbound on pizzaboy

Ive been trying to do this for months, I feel so stupid. Ive tried to look this up and I get old reddit posts that just say "just download and play!" Or outdated YouTube videos.

Here's where im at; ive downloaded unbound, downloaded Fire Red squirrels 1636, I added them to a folder and extracted them. Ive been trying to use a pitcher but keep getting all sorts of errors. I have no idea what to do, any help is appreciated.