The correct steps to install macOS Mojave on your Mac running Catalina and later macOS are: erase your startup disk (Macintosh HD), c reate a bootable USB installer, and install the macOS Mojave onto your Mac. You are unable to directly install an older version of macOS on top of a newer one. When the download of the macOS installer completes, it will open automatically, and if your current macOS is older than the downloaded one, just follow the instructions to install macOS, if not, quit the process here. This comes to support Apples credo that any device made more than 7 years ago is too old and obsolete to support the newer capabilities in software development. Once you see the macOS Utilities screen, select Reinstall macOS. Is my Mac too old for High Sierra In short, any Mac from 2009 or newer has the configuration to support macOS 10.13 High Sierra. You should make sure there is enough disk space for the new macOS installer.īefore installing the downloaded macOS on your Mac, you'd better back up your Mac to avoid data loss. Running High Sierra Restart your Mac, while holding down the Shift+Option+Command+R keys. Upgrading from an older version of macOS If you’re running High Sierra (10.13), Sierra (10.12), or El Capitan (10.11), upgrade to macOS Catalina from the App Store. Click Upgrade Now and follow the onscreen instructions to begin your upgrade. Then click Get to download macOS Mojave/Catalina/Big Sur on your Mac. Go to Software Update in System Preferences to find the macOS Catalina upgrade. A window will pop up and ask Open App Store.app? Click the Open button to open Mac App Store where you can see the entry of the target macOS version.
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