Since OS-X Mavericks (10.9) Apple have been releasing their OS X upgrades for free. Click Reinstall macOS and wait for macOS Catalina to be installed on your machine. Your Mac should then open in Recovery mode. Select the bootable installer and click Enter. Restart your Mac while holding Option/Alt (depending on when it was made) to access Startup Manager. How do I install the latest version of OSX on an old Macbook? How far you choose to upgrade your Mac is entirely up to you. If the old version of OS X you’re running doesn’t get important updates to Safari anymore, you’re going to have to update to a newer version of OS X first. Older versions of OS X don’t get the newest fixes from Apple. Learn about macOS Big Sur updates, for example. Click Update Now or Upgrade Now: Update Now installs the latest updates for the currently installed version. Update macOS on Mac From the Apple menu  in the corner of your screen, choose System Preferences.

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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. 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. 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.

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.

How do you update os x on mac