@loximuthal - if you can't tell, I sure can't
If the plugin is on your context menu/toolbar and working - then you don't have a problem.
If it isn't there (and you definitely have added it via Preferences -> Toolbars), try installing it again. If it still doesn't appear after restarting calibre, restart in debug mode and post the output of that. I have no idea what that error message means (it is not specific to this plugin) but perhaps there was some sort of issue when it tried to download the plugin update (maybe AV or something).