Deleted the volume “Macintosh-Data” and add a new one, then reinstore Catalina OS, after complete, but cannot shut down os. I have Catalina MacOS ver 10.15.7. It is 2012 device. I am not able to log into Apple id and therefore not able to reach Zapp store or any Apple site. In response to siffis. As mentioned in that article, Apple's convention to date has been to continue to provide security updates for the current version (now Big Sur) and two previous versions. ( Catalina and Mojave) This time around, they issued an update for High Sierra when Big Sur was released. (This may be the final Update for High Sierra.

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macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.

Check compatibility

macOS Big Sur is compatible with the following computers. If your Mac isn't compatible, you might be able to install an old version of macOS instead.

MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.

If upgrading from macOS Sierra or later, your Mac needs 35.5GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.

Download macOS Big Sur

If you're using macOS Mojave or later, get macOS Big Sur via Software Update: Choose Apple menu  > System Preferences, then click Software Update.

Or use this link to open the macOS Big Sur page on the App Store: Get macOS Big Sur. Then click the Get button or iCloud download icon.

Install macOS Big Sur

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After downloading, the installer opens automatically. Click Continue and follow the onscreen instructions.

Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, it might restart and show a progress bar or blank screen several times. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

Stay up to date

After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. To check for updates, choose Apple menu  > System Preferences, then click Software Update.

heyyitsmike Said:

'Why can't I download macOS Catalina?: I have a MacBook Air 13-Inch, 2017 model but whenever i try to install it, it says that my mac is up to date. I even used the system preferences to search for a new update but it came up empty. What should I do?'

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Try these Three Methods...

A. Create a New Administrator User:

See if you can install this, through use of a new Administrator user.

B. Resetting the SMC and NVRAM:

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Sometimes operations are performed and then the keyboard settings become manipulated, technically. So... Try resetting the SMC and NVRAM. Then reboot, trying this once more.

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C. Scan your Mac for Malware:

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Malware, which makes you Mac, run in malicious manor. Use Malwarebytes Anti-Malware for Mac

1. Download it
2. Install it
3. Update it
4. Scan with it
5. Remove what is Found
6. Reboot the Mac
7. Remove it, if desired: Malwarebytes uninstaller

Dec 25, 2019 8:32 PM