Mac some Audiobook Converter with iTunes 12.2.1

Hi everyone,
I really like this Audiobook converter for converting Audible books. It is useful if you want to make DRM-free copies of your books for personal use.
However, the latest version does not seem to find my audiobooks in my iTunes library. Is there a way to get the "Audiobooks" category from the "more" tab and back into the sources table? I believe this is why Audiobook Converter is not finding the books in my library and says I have none.
Thanks.