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How can I undo this upgrade to skip this plugin.

You probably want to open a support request.

The issue is related to the "Pmviewer" application. You may need to contact the application author (we wouldn't really be able to assist with the upgrade of a third party application).

It's entirely possible it's doing something like looping through every single PM to do something to it and just not reflecting this back in the UI. If that's the case, it may not be an issue. Unfortunately though only the application author can confirm that for you.