What you need to send KFX to your computer is calibre 8.x. (as of today the current calibre is 8.2.1), DeDRM Alpha, KFX Input, and KFX Output.
You plug your Kindle into the USB port
Drag/drop the .kfx file from the Kindle to your calibre library
YOU DO NOT COPY THE .KFX TO THE COMPUTER OR YOU WILL NOT HAVE A COMPLETE KFX EBOOK. KFX come in multiple files. When you drag/drop directly from the Kindle, the KFX Input plugin will grab the other files and add them to the KFX file so you will have a complete eBook in calibre.
This is the same if you are using K4PC. Drag/drop from the source directory to your calibre library. no copying first.
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