[jhowell]

Originally Posted by Overkatefinated

I had zero issue using the previous version but now my books will no longer convert, they are stuck in the "KFX, MD" format.

If you see a format of MD in calibre after importing a book downloaded using Kindle for PC that indicates that you selected the wrong file for import. The correct main KFX file has an extension of ".azw". A supplemental metadata file found in the same folder has as extension of ".azw.md". Importing that will not work since calibre sees ".md" as an indication that the book is in markdown format instead of KFX.

This can be confusing because the Windows File Explorer does not show file extensions by default so a file with the extension ".azw.md" will appear there as ".azw". There is a setting in File Explorer that can be checked to show extensions. I recommend that be done to avoid this sort of problem in the future.