@s.lee.f To install plugins calibre needs to access this site (ie MobileRead). Hence calibre needs to get though your firewall. You may need to allow that to happen by changing your firewall's settings.
If you don't want calibre to get through your firewall you can download the plugins from the first post of their thread in this forum, and install via Load plug-in from file.
If you don't allow calibre to get through your firewall, you wont be able to download metadata, use the Get Books feature and various other things.
BR
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