Adobe Digital Editions is not part of the process for Amazon books - it is only needed for epub format from epub sellers
current version of Kindle for PC will download books in amazons newest format, which is multiple files per book. if you can get back to an old (v1.7) version of K for PC, that will no longer happen, so long as you block program updates.
so your simplest solution is to delete K for PC books folder, and the K for pc program, install an old version ( search her or google for links) , REGISTER IT WITH YOUR AMAZON ACCOUNT, and re-DOWNLOAD the amazon books in the old style formats, then import the K for PC books folder into calibre ( with the latest version of Alf's tools add-on installed into calibre). sometimes Alf's stuff glitches on bulk imports, so consider doing them one at a time
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