To download macOS Sierra 10.12, Apple provides a direct disk image (
Apple provides a direct disk image file for Sierra that you can download using a web browser (Safari is recommended). Download Mac Os Sierra 10.12 Dmg
softwareupdate --list-full-installers
To install Mac OS Sierra 10.12 from the DMG file: To download macOS Sierra 10
Once you've downloaded the InstallOS.dmg file, you can't just run it to upgrade. You first need to extract the actual "Install macOS Sierra" app: Double-click the downloaded file to mount it. To download macOS Sierra 10.12
If your Mac originally shipped with Sierra: