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Method 2A - Disable KFX support in Kindle for PC at startup See the end of this post for ways to prevent undesired updating of the Kindle app. Kindle may try to update itself without asking for permission.If asked if you want to update to the new version always reject it.Re-download your books before importing into calibre.
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(If all else fails then re-install and register again and start over with step 1.) Wait a few minutes for it to take effect and try to sign in again. If that occurs go to the Amazon website and on the manage your content and devices page, and on the "Your Devices" tab locate "Kindle for PC" (or Mac) and deregister it using the "." "Actions" menu. Some users have reported being unable to sign in to their Amazon account within Kindle for PC once version 1.17 is reinstalled.
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Method 1 - Revert to an older version of Kindle for PC/Mac The following descriptions apply both to Kindle for PC and Kindle for Mac unless one is mentioned explicitly. There are several methods for either avoiding or handling KFX format. Unless additional steps are taken, these books will fail to convert in calibre with the error: "KFXError: This is an Amazon KFX book. Each book will appear in a separate subdirectory of the "My Kindle Content" folder with a file extension of ".azw". The Kindle for PC and Kindle for Mac programs use Amazon's KFX format for most books.
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