: Restart your Mac while holding the Option (Alt) key and select the installer from the list.
Elias closed the lid of his laptop. The file sat in his trash can, waiting to be emptied. It was just a piece of code, a "new" copy of an old ghost, but tonight, it had saved the city a lot of trouble. He clicked "Empty Trash." The ghost was gone, but the machine lived on. macos high sierra 10136 dmg new
Elias paused the download completion. He ran the hash check against the database of known Apple SHA values. The numbers spun in his terminal window. : Restart your Mac while holding the Option