On the 26th February 2025 Amazon removed Download and Transfer. This means only delivery by WiFi direct to a Kindle or Kindle App. Amazon always put DRM on KFX, ignoring publisher request for DRM free. All Kindle Apps, Fire and eink Kindles after the Paperwhite 1 get KFX rather than azw3/KF8, which was DRM free, if a Publisher requested it.

EDIT:

July 2025: All titles are back on Amazon, everywhere but by publisher ISBN. Previous KDP ASIN links are not valid.