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Begin installationĪfter installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra.Ĭlick Continue and follow the onscreen instructions. Then double-click the file within, named InstallOS.pkg.įollow the onscreen instructions, which will guide you through the steps necessary to install. Install the macOS installerĭouble-click the downloaded file to open a window showing its contents. A file named InstallOS.dmg will download to your Mac. If you still need macOS Sierra, use this link: Download macOS Sierra. Download macOS Sierraįor the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system. If you're using a Mac notebook computer, plug it into AC power. It takes time to download and install macOS, so make sure that you have a reliable Internet connection.

Time Machine makes it simple, and other backup methods are also available. Make a backupīefore installing any upgrade, it’s a good idea to back up your Mac. If your Mac isn't compatible with macOS Sierra, the installer will let you know. To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . MacBook Pro introduced in mid 2010 or later

MacBook Air introduced in late 2010 or later Your Mac also needs at least 2GB of memory and 8.8GB of available storage space. You can upgrade to macOS Sierra from OS X Lion or later on any of the following Mac models.