How to swap out a kindle file if there is a new one (if you bought NWH)

The first small group of copies that sold had a few typos on the first page of chapter one because the publisher didn't realize he needed to "accept all changes" even though the file looked perfect, so hidden changes in the doc showed up. To swap it out for the fixed copy just archive this one, then refresh, and reload the file and voila! Perfect copy replaces the old one. :) Sorry about that. Good thing I checked, eh? I tested this myself and it worked!