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! Do NOT try to start all over again, uninstall Max's Pitch Package, etc. That can make it worse. There's a 95% chance the same snag/fix is listed & answered in the Help FAQ. But if you can't find it there, post your problem here.
Make sure you post in the right category below & be sure to include a screencap showing the issue!