Has Amazon changed its DRM in the last day or two?
I was able to download a book to Calibre yesterday with no difficulty. The book in question was fairly new - published in May 2026. It wasn't, AFAIK, DRM-free; indeed, I'd be surprised if it was.
Today, I tried to download another book (one published in September 2025). It came through as KFX-ZIP, not KFX. I was unable to open or convert it.
Yes, I am using the latest alpha DeDRM, obtained
here.