at the top of the doc, it's labelled that it hasn't been updated since 1.2.1. I haven't bothered to bring it up to date because I don't work on this project anymore, and updating the tutorial doc is a pain ( you add one line and the entire document shifts, fucking up all the images. trust me its not as easy as it seems ). I'll come on here to answer simple questions when I can but that's the most I'll do when it comes to this project.
Not being able to download files from itch is on you, I double checked it and confirmed the files download just fine.
Lastly being passive aggressive and asking for help in the same statement is crazy... The pettier side of me just wants to tell you to go eat a shoe! It's now labeled as outdated on the itch page, but I did it for brook one piece, not for you.