How to download and install older macOS versions on compatible Macs

If you've ever have to wipe the drive of a very old Mac , you know you need an old macOS to get it running again. Beyond Restore, Apple only grudgingly allows downloads, but others are trying to make it easier. You can download installers for most versions of the Mac operating system back to OS X Lion - image credit: Apple Apple does rather prefer you to use only the latest version of macOS , but it's not as if it charges you to do so. Eventually you might need to buy a new Mac, so there is some