I found a workaround for my issue that *might* help others.
- I had all my books delivered to the Kindle app on my Android phone
- I opened the book(s) I wanted to transfer. The file is downloaded to my phone.
- I connected my phone up the Calibre.
- I downloaded the book to my hard drive. The books are still in the cloud if something happens to the files.
Hope this helps someone else.
Mary