Update to version 2.11.5
I have just released version 2.11.5 of the plugin. This fixes a couple for Python 3 problems for calibre version 5. Including the problem reported by @nreuter.
The plugin should still be compatible with most versions of calibre, though I have only test recently with 3.48 and 4.23.
Calibre should announce the update in the next hour or so. If there are any problems, please report them here.
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