To install macOS Sierra 10.12, you must first download the official disk image from Apple, extract the installer app, and then either run it directly or create a bootable USB drive Apple Support 1. Download macOS Sierra 10.12
Before beginning, ensure your hardware meets the minimum specifications:
Open Terminal and paste the following command:sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraInstaller --applicationpath /Applications/Install\ macOS\ Sierra.app
- MacBook (Late 2009 or newer)
- MacBook Pro (Mid 2010 or newer)
- MacBook Air (Late 2010 or newer)
- Mac mini (Mid 2010 or newer)
- Mac Pro (Mid 2010 or newer)
3.2 Creating a DMG from the Installer
If you have the .app installer file, you can create a bootable DMG:
If you need to perform a clean install, you can create a bootable USB drive (at least 8GB required) using the extracted installer and Terminal. Apple Support Community Plug in your USB drive. and enter the following command (replace with the name of your USB drive):
