Quote:
Originally Posted by proud_wolf
in fact no - the installed plugin disappeared from the calibre. And after that it is available in 'Available to be installed' but not in 'Already installed' plugin section
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The plugin failed to initialise because the iOS device was connected. Hence calibre couldn't display it as an installed plugin. When you opened calibre without the iOS device connected, it could initialise and was displayed.
In any case, it doesn't matter. The plugin does not work with any iOS version since 8.3. So, it doesn't matter if the plugin is displayed or not. If you can fix it, you will make a lot of people happy.