I'm happy to report that all is well after I uninstalled using Windows Apps Menu, and then re-installed one of the earlier 4.xx versions -I did not even have to re-install any of my plugins, they just were there.
Now everything works as it should. Calibre is one of the absolute best things I've ever used to make my life work better. I'm now going to give another donation to the ingenius, and kind Kovid Goyal.
My heartfelt thanks to all the generous people who messaged with helpful information.
Keep Safe,
Dan
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