How to reinstall macOS High Sierra on your Mac?
If you have a Mac running macOS High Sierra, you’ll probably want to install the latest macOS HighSierra update as soon as possible.
Apple has released a handful of new versions of macOS High in the last year.
Here are the ones you need to install now if you have one running High Sierra: macOS High – September 22, 2018 macOS High (sierra) – September 23, 2018 Windows 10 High – October 3, 2018 Mac OS X High – November 21, 2018 OS X 10.11 High – December 17, 2018 If you’re a regular Mac user and don’t have an older version of macOS, you can install the current High Sierra version of High Sierra.
You’ll need to reinstalling macOS High if you’re not using the latest version of the OS, or you’ll need the latest High Sierra update if you are.
macOS High should be installed if you can’t run macOS High, and macOS High will not need to be reinstalled.
To reinstall the latest Sierra update, simply restart your computer and boot into your Mac’s menu.
If your Mac is powered down, hold down Command and then Option and Option to select Power Off.
Mac OS High Sierra should now be installed.