Since Mac OS X 10.7, Apple proposes to get macOS (ex-OS X) major updates from the Mac App Store, through a macOS / OS X Install application. Download, install, Mac updated. Beautiful. But what happens if you wish to restore your Mac from scratch (with the hard drive or SSD formated)? Or if you wish to install the new OS on many Macs ? Or help a friend with a slow Internet connection? That’s when y
