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That looks like your security software is stopping Calibre from accessing the network. Many security packages treat new versions as new programs that need re-authorising to access the internet.
In terms of downgrading, uninstalling Calibre does not touch your existing library or settings. You can therefore safely uninstall Calibre and install another version. However if you are feeling paranoid you could always make a backup of the Calibre library folder and its contents before doing this.
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