I've been using Calibre for some years now, and I faithfully install the newest version when prompted to do so. But everything newer than version 2.16.0 won't open. They each install just fine, but when I click the icon to open Calibre for use, all I get is it telling me Calibre is not responding and it stays that way indefinitely. Twice now I've had to completely uninstall Calibre and re-install version 2.16.0. Any idea what's going on with the newer versions please?
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