Playbook

Audible to M4b
Prerequisites:
Install BookLibConnect https://github.com/audiamus/BookLibConnect 
Install AAX Audio Converter https://github.com/audiamus/AaxAudioConverter
Downloading the Books:
Run BookLibConnect
Make sure your Export Folder is in a good place with lots of space, for me its D:\Data\Audible
Press Download
Press Resync
Add any book not already sync'd
Press OK
Back in the main window press Run
Converting the Books: