#Macminer macsierra 64 BitCatalina & Big Sur supports only 64 bit and there is no workaround. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Make Time Machine Backup is very useful and can be used to Revert to Previous Working macOS The format will be need if moving to Catalina. It should better position the machine with Boot ROM updates needed for the drive conversion to newer APFS Format. Might suggest moving to at least High Sierra. For Best results use Safari to commence the download as Others may not work. #Macminer macsierra how toWith the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there. The Age of this computer will Govern what newer version of macOS it will Qualify to install. Either way you would need a suitably sized USB memory stick (around 5GB per installer). #Macminer macsierra installI don't know whether they would be willing to provide you with a download of the required installers, but asking may be your only option, unless you can get someone with a more up to date Mac to download and save the installers (which if not stopped would install and then self-erase). If you don't feel like performing this fandango you could try Apple Support. 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.) 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. 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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