When I click next after the edit mapping page, I get a window that says "the matching pitch you chose (Pitch ID) is not mapped and is required for an Update and Insert operation".
the google drive doc I downloaded is titled "MaxsPitchData.csv"
Sorry you're stuck but there's almost always a pretty easy fix! Don't try to start all over again–not necessary! Don't start undoing stuff and don't uninstall Max's Pitch Package, etc.
There's a 95% chance the same snag/fix is listed & answered in the Help FAQ. Check that first but if you can't find it there, post your problem + a screencap in the proper category below & we'll post a solution back ASAP!