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The certificate used to sign calibre on windows expires Oct 2025, so it cant be an expired certificate. And windows shows no issues for me with calibre. I just tried downloading and installing it on my win11 machine. No errors or warnings. Right clicking on calibre.exe in windows explorer and choosing properties->digital signatures shows the signature is OK.
I'm not a windows user so I cant really help but off hand I'd suggest check your system certificates, probably something there is expired/corrupted or similar.
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