macOS Sierra 10.12.6 DMG File Download — Guide and Notes

Summary

: Because it is the last stable build, the 10.12.6 DMG or ISO is the preferred choice for running macOS Sierra in virtual machines like or VirtualBox on non-Apple hardware. Core System Requirements

Run the Package: Inside the mounted image, double-click the .pkg file. This will "install" the actual installer app into your Applications folder.

Apple’s Official Support – Apple previously provided direct links to Sierra via the App Store, but those have been retired. You may still find it through your Purchased tab in the App Store if you had downloaded it before.