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. Within OS X Utilities, choose Reinstall OS X. Prepare a clean external drive (at least 10 GB of storage). The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Select your startup disk and click Install. Install older OS X onto an external drive. Click Continue and follow the on-screen instructions. 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. Once you see the macOS Utilities screen choose the Reinstall macOS option. 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.The installer for OS X El Capitan downloads to your Downloads folder as a disk image named InstallMacOSX.dmg. Enterprise administrators: Download from Apple, not a locally hosted software-update server. 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. Download on a Mac that is using macOS Sierra 10.12.5 or later, or OS X El Capitan 10.11.6.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. In the System Preferences window, click Software Update.From the Apple menu in the corner of your screen, choose System Preferences.Then follow these steps to find and install any available software updates or upgrades. Before you get started, it's a good idea to back up your Mac.
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