He held his breath. He wrote the ISO to a USB drive using Rufus on his Windows PC—careful to select "DD Image mode" to preserve the boot sectors. Then he walked over to the silent Mac mini, plugged in the USB drive, and pressed the power button while holding down the Option key.
He clicked it. The Apple logo appeared. A progress bar, agonizingly slow, crept across the screen. macos high sierra download iso
Then he smiled, closed his laptop, and went to make coffee. He held his breath
The USB drive showed up: a bright yellow hard disk labelled "macOS High Sierra Installer." plugged in the USB drive