[1] Back up the 2011 file (for future possible use) from folder ...\calibre\plugins.
[2] Exit from Calibre.
[3] Go to folder ...\calibre\plugins and copy your custom .zip into that folder, replacing whatever is there. Do not mess with the .json files, since they have nothing to do with your issue.
[3] Run Calibre.
[4] Preferences > Plugins and load your personal .zip by specifying its path.
[5] Restart Calibre.
You can always "uninstall" a plugin from Preferences > Plugins.
DaltonST
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