The latest Kindle update disabled the ability to remove the DRM. There's really nothing else to do but
1) downgrade your Kindle firmware (only possible with jailbroken Kindles), or
2) get an older Kindle no longer receiving updates, or
3) wait until someone figures out a way to get around this latest development (might never happen).
I'd say go for the option 2, unless your Kindle is jailbroken.
Changing calibre and plugin versions won't help, it's a Kindle firmware issue.
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