@KindleAZWorKFX
The plugin author hasn't been seen since "Last Activity: Jul 10th, 2016 08:37 PM" and the plugin was last updated when Calibre 2 was the go to version (22nd Mar 2015).
Also Calibre 5 is written in Python 3 while the earlier versions were in Python 2 so that is a big issue here.
Basically this plugin isn't compatible with Calibre 5 and the author left the building nearly 6 years ago.
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