Almost at the point of giving up....and then!!
I had spent literally hours trying to work out what I could do to convert my kfx (Amazon Format) e-books. I tried all the "foolproof" and "guaranteed solutions" all to no avail. I was almost at the point of giving up when this application was recommended by someone on Reddit. I download and installed, it automatically found and converted around 20 books in less that three minutes. Exceptional! *****