Version 6.6.0 of the tools is now available. Please update to the latest version if you are having issues.
DeDRM_tools_6.6.0.zip can be downloaded from
This release incorporates works by several people to give initial KFX support to the plugin. If you are not interested in removing DRM from the new Kindle KFX format, then there is no need to update at this time. We still recommend using the older Kindle formats when possible for more successful conversion into other formats.
Install the KFX Input Plugin to automatically locate all of the files that make up a KFX format book and gather them into a KFX-ZIP. After the DeDRM plugin removes the DRM, then the KFX Input Plugin will package it into a single KFX file.
To leave a comment, see the previous post: DRM Removal Tools for eBooks.