If an error occurs while installing an update or upgrade, learn how to resolve installation issues. If you downloaded any apps from the App Store, use the App Store to get updates for those apps. I've made sure all the programs (that aren't Apple's) are 64bit so there should be no issues. The MacBook Air is definitely supported and has hundreds of GB's of free space. I'm having a problem trying to install Catalina. When Software Update says that your Mac is up to date, then macOS and all of the apps it installs are up to date, including Safari, Messages, Mail, Music, Photos, FaceTime, and Calendar. No, there's no need to do any of the intermediate updates.

Software Update shows only upgrades that are compatible with your Mac.

Upgrade Now installs a major new version with a new name, such as macOS Monterey.

Update Now installs the latest updates for the currently installed version, such as an update from macOS Big Sur 11.5 to macOS Big Sur 11.6.

Use either the keyboard's arrow keys or the mouse to select 'Install MacOS High Sierra.' Press enter or click your selection with the. When you see the boot selection screen as shown, release the option key. How to back up your Mac Next, it is not a bad idea to think about partitioning your Mac so you can install macOS Big Sur in tandem with your current Mac operating system. Hold down the option or alt () key on the keyboard and power on the device. The first, and most important thing you should do before upgrading to macOS Big Sur (or updating any software, no matter how small), is to back up your Mac.

If your System Preferences doesn't include Software Update, learn how to upgrade to macOS Monterey or upgrade to an older macOS, and use the Updates tab of the App Store app to get app updates. Plug in your macOS High Sierra bootable flash drive.

In the System Preferences window, click Software Update.

This covers all the steps you need to do the upgrade.If you cant find High Sierra in the Mac App St.

From the Apple menu  in the corner of your screen, choose System Preferences. Here we show you how to upgrade to Mac OS X High Sierra.

The 14th major release of the desktop operating system from Apple, macOS High Sierra, had technical updates. Then follow these steps to find and install any available software updates or upgrades. Apple announced macOS High Sierra on June 5, 2017, at the WWDC in San Jose, California. Before you get started, it's a good idea to back up your Mac.

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