Downloading a macOS Sierra 10.12 dmg file install is a straightforward process if you know where to look and how to verify integrity. Whether you are reviving a 2011 MacBook Pro, running a legacy recording studio, or simply preferring the skeuomorphic UI of Sierra, this OS remains a workhorse.
Open the mounted disk and double-click the InstallMacOSX.pkg file.
Apple still hosts old installers on its servers, but they are hidden. You can use a direct curl command to retrieve the InstallOS.dmg or InstallMacOSX.dmg :
Before installing macOS Sierra 10.12, ensure that your Mac meets the system requirements:
Before beginning, ensure your hardware meets the minimum specifications:
Inside the mounted image, double-click the .pkg file (often named InstallOS.pkg ).