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Begin installation After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra. Click Continue and follow the onscreen instructions. OS X El Capitan remains available for Mac computers that can't upgrade to ... Mojave, High Sierra, or Sierra, or that need to upgrade to El Capitan first. ... It takes time to download and install OS X, so make sure that you have ... It depends on your circumstances.