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Works for me. The plugin index site uses a private https certificate that is bundled with calibre. If it is failing it usually means you have some system software/malware that is proxying your https connections, and serving up its own certificates for all https connections. Because calibre checks against its bundled certificate, instead of the system certificate store (which wil havebeen modified by the proxy software), the check is failing.
If you haven't installed any new security software recently, it is likely malware.
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