Even with the reset stone, a stats menu would be welcome.
It's a pain to keep track of Jasmine's stats without save-scumming and impossible to keep track of the Old Man's or the other girls'.
Yeah, the game uses rpa files to run, and the instructions say to unzip then move the rpa file, so I think the instruction to unzip is based on an assumption that itch is providing a compressed file when it's not.
As for starting over, that depends on where you're at, but as a rule when I mod something, I start over to ensure everything works.
Based on other q&a threads here, there's no indicator that it's installed correctly. You have to find Amy for the first time and her path with either be available or it won't.