download upgrade to my macbook air
need to update/download the OS X for my macbook air, how do I do that?
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Upgrade macOS to macOS Big Sur 11
1.For instructions:
https://support.apple.com/en-us/HT201475
https://support.apple.com/en-my/macos
2.Check Applications Compatibility.
Click
“VIEW THE COMPATIBILITY ” button at the bottom of the page.
3. Reset PRAM: Reset NVRAM or PRAM on your Mac - Apple Support
Settings that can be stored in NVRAM include sound volume, display resolution, startup-disk selection, time zone,
and recent kernel panic information. The settings stored in NVRAM depend on your Mac and the devices
that you're using with your Mac.
4. Startup in Safe mode. https://support.apple.com/en-gb/HT201262
To leave Safe Mode, click in the menu bar and choose “Restart”
Quote:
Safe mode prevents your Mac from loading certain software when it starts up,
including login items, system extensions not required by macOS, and fonts not installed by macOS.
It also does a basic check of your startup disk, similar to using First Aid in Disk Utility.
And it deletes some system caches, including font caches and the kernel cache,
which will be created again automatically as needed.
5. Backup your Mac
6. Install macOS upgrade
How to get old versions of macOS?
If your Mac isn't compatible with the latest macOS, you might still be able to upgrade to an earlier macOS, such as macOS Catalina, Mojave, High Sierra, Sierra, or El Capitan.