How to install macOS High Sierra
Apple has released macOS High Sierra, which offers new features such as Apple File System, new features in the Photos app, improved video playback, and more. You can get these new features—and the entire operating system—for free.
Before you install High Sierra, you should back up your Mac. Run Time Machine or your online backup service if you have one. You can also read our review of High Sierra to learn more about the features and read our High Sierra FAQ to prep your Mac. Set aside some time to run the installer, at least an hour, depending on your internet connection speed. Once you’re ready, follow the instructions below.