Oh, and if you are wiping your Mac for sale, be aware of something else Apple says in the article I linked above: Obviously, this would be most useful if you were intending to just install the operating system before selling your computer you can’t put Yosemite, say, over an existing High Sierra install (or any version that came later than Yosemite) without erasing the Mac’s drive first. Shift-Option-Command-R (for Macs upgraded to 10.12.4 and later) or Option-Command-R (for all other Macs): Installs the version of macOS that came with your computer or the closest available version.įor example, my computer is an early 2015 MacBook Pro running 10.13.3, and when I hold down Shift-Option-Command-R at startup and pick “Reinstall macOS” afterward, the machine offers to install Yosemite for me.

Option-Command-R: If you start up your Mac while holding these keys, selecting “Reinstall macOS” within macOS Recovery will allow you to upgrade your Mac to the latest compatible version. The basic shortcut, Command-R, will use whatever was already on your computer. As Apple points out in this support document, there are several key combos you can hold down when you’re starting up your machine to tell the Mac what to install.

When you need to reinstall macOS on a computer, how you’ll go about it depends on which version of the software you’d like to use.

Installing blossom for r mac os x