In the second line they presumably mean the 'System'>'Certificates' section of Keychain access. Let's Encrypt DST Root CA X3 expiry Sept 30th 2021 | Certify The Web Docs Find the ISRG Root X1 certificate in System and double click on it, open the Trust menu and change "Use System Defaults" to "Always Trust", then close that and enter your password to confirm the change (if prompted).Open the Keychain Access app and drag that file into the System folder of that app.Download the ISRG Root X1 certificate file from.
There is a workaround for the certificate, but I emphasize that I haven't tried it and don't know whether it's effective or even advisable: (I'm not sure, but possibly Sierra is the oldest system not to have an expired certificate.)
#Upgrading late 2012 mac mini install#
If you install this you may be able to access the Catalina installer, but I have a nasty feeling that you might still be stuck with the expired certificate and be back where you started: probably worth a try. However, according again to that help page, you can download macOS Sierra 10.12 installer, which comes as a direct link to a disk image and which, oddly, is http not https.
#Upgrading late 2012 mac mini upgrade#
So basically you cannot install the upgrade until you have installed the upgrade. Firefox can access https sites as it uses its own certificate, but it cannot open these links (which need to open the Mac App Store). (secure) Safari on your Mac cannot access https sites because the security certificate has expired. Then you can install macOS Catalina 10.15 According to you have to first install macOS Mojave 10.14.
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