For what it may be worth, I played with both scripts posted in this thread. The one from jedi425 from
https://github.com/Jedi425/BulkKindl...er/tree/master worked quite well. Oddly, several books that downloaded with a ^% in the file name had a truncated file extension (blank, .a or .az). A bulk rename to .azw seemed to have fixed most of those issues. The Tampermonkey script (see
message #78 in this thread) worked but did require me to click on the next page and then the Download button in blocks of 25 books. Both of them failed on a couple of books, one of which was the one that Amazon said could not be downloaded for a PW4 but that the PW4 was happy to download when I was testing the TamperMonkey script.
Sadly after all the fun, I only found 1 book that was not already in my calibre library. A quick perusal of the book showed why I had removed it. An AI could have done a better job and with fewer spelling and grammar errors.