On each pc, the title bar of kindle for pc, when running, shows what silly name amazon is using. So check that, then rename via web site as needed.
I suggest you cycle through all amazon accounts to liberate all you books into calibre.
Make a list of accounts. Register k for pc to 1st account on the list, download all purchases, add them to calibre. Drag and drop or use auto add.
then unregister that k for pc, register it to 2nd amazon account....
Alf plugin should do its background magic. There is no download all button. So much clicking needed.
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