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 if you have one. You can also read our to learn more about the features and read our 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.

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How to install macOS High Sierra • Launch the App Store app, located in your Applications folder. • Look for macOS High Sierra in the App Store. You can also do a search, but you’ll probably find it in the top marquee carousel or somewhere in the Features section of the store. Click on it once you find it.

• This should bring you to the High Sierra section of the App Store, and you can read Apple’s description of the new OS there. When you’re ready, click the Download button at the upper left. The download will take a few minutes. The installer software is over 5GB. Apple • When the download finishes, the installer will automatically launch.

You can quit (Command-Q) if you want to run the installer later. It will be saved to your Applications folder. Click Continue if you want to proceed. Apple • Read the software license agreement and click Agree.

• Select your Mac’s startup drive and click Install. • You must enter the username and password for the new “helper tool” that the installer wants to install. Enter this information and click Add Helper. • The installer will tell you it needs to restart the Mac to proceed. Click Restart. Apple • If you have other applications open, the installer will ask to close those apps. Click Close Applications.

• Your Mac will restart and proceed with the installation. When it’s done, you’ll have High Sierra on your Mac.

Contents • • • • • • • • • • • • • • • • • • • • • Apple introduced macOS High Sierra at the 2017 Worldwide Developers Conference in June. MacOS High Sierra, as the name suggests, is a follow-up to macOS Sierra and is largely designed to improve on macOS Sierra through major under-the-hood updates and a handful of outward-facing changes. With macOS High Sierra, Apple says it's focusing on the fundamentals: data, video, and graphics. High Sierra is about deep technologies that provide a platform for future innovation while also introducing new technologies to make the Mac more reliable, capable, and responsive. A more modern file system, Apple File System (APFS), is the new default in macOS High Sierra.

APFS is safe, secure, and optimized for modern storage systems like solid state drives. It introduces features like native encryption, safe document saves, stable snapshots, and crash protection. APFS is ultra responsive and brings major performance improvements for Macs. High Sierra includes High Efficiency Video Encoding (HEVC, aka H.265), which preserves better detail and color while also introducing much improved compression compared to H.264. HEVC software encoding is available for all Macs in High Sierra, but newer models include HEVC hardware acceleration.

Along with a new Apple File System, macOS High Sierra introduces Metal 2, the next-generation version of Apple's Metal graphics API. Metal offers up to 10x better draw call throughput improvements like driver optimizations, indirect argument buffers, sampler arrays, resource heaps, and more. The Mac's window server uses Metal 2 optimizations to make window animations like Mission Control much smoother. Metal 2 brings support for machine learning, external GPUs, and VR content creation. Apple is providing an external GPU development kit for developers and it is working with Valve, Unity, and Unreal to bring VR creation tools to Mac. Support for eGPUs was introduced in the 10.13.4 update.