Since amazon changed things in 04/2025, I am not able to download any books published after that date. I only have Kindle for PC & have no other devices. I haven't upgraded Kindle for PC software & am using old version & had been downloading & converting after they switched to KFX format a few years ago. It automatically downloads purchases to my PC when I open Kindle for PC program, but now only if they were published before 04/2025. People that only have Kindle for PC say they are able to download recent books with updated version of Kindle for PC but cannot unlock & convert them in calibre. I have latest version of calibre. Don't know if there is new update to DRM tools. Can anyone help or provide insight?