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• Update From Mountain Lion
• Upgrade From Mountain Lion
• Upgrade From Mountain Lion To Sierra
• Upgrade From Mountain Lion To High Sierra

Mountain Lion is really just a ‘super’ update of Lion. The ML graphical interface is still the same as Lion’s so they should just have made it a update of Lion, of course they have to compete with Microsoft’s Windows 8 so fell into the temptation. OS X 10.8 Mountain Lion is Apple's latest operating system for Mac. It brings OS X much closer to iOS in terms of features and syncing with iPads and iPhones. We've already given you a lowdown on the most important changes in Mountain Lion most of which are features taken from iOS. We encourage all users on these operating systems to upgrade to newer versions of macOS in order to have ongoing access to the latest features of Steam, and to ensure future access to all games and other Steam content. Users of macOS versions 10.7 ('Lion') through 10.10 ('Yosemite') can find more information on upgrading macOS here.

Upgrade to macOS Big Sur

Before installing this upgrade, make sure that your Mac is ready.

Check compatibility

macOS Big Sur supports most Mac models introduced in 2013 and later.

Make a backup

Update From Mountain Lion

Before you upgrade, make a complete backup with Time Machine, or store your files in iCloud.

Free up space

If the installer needs more storage space to upgrade, you can free up space using tools that come with your Mac.

Download macOS Big Sur

If you’re using macOS Mojave or later, choose Apple menu  > System Preferences, then click Software Update. If you’re using an earlier macOS, use the App Store instead.

Get to know macOS Big Sur

Learn about some of the new features of macOS Big Sur.

Control Center

Control Center brings favorite controls such as Bluetooth, Wi-Fi, Do Not Disturb, and Sound together in a single place—so you can easily adjust them at any time.

Notification Center

Upgrade From Mountain Lion

Notification Center puts notifications and>

Safari

Customize your start page, navigate with ease using the new tab bar, and access a new privacy report to see just how Safari protects your privacy as you browse.

Maps

Discover great places around the world and navigate easier with guides, cycling directions, indoor maps, Look Around, electric vehicle routing, and more.

Messages

Upgrade From Mountain Lion To Sierra

Send messages to friends and family using new tools that make it easier to keep track of group conversations and give you fun, engaging ways to express yourself.

Photos

Use the expanded editing capabilities in Photos to easily make simple changes and more advanced adjustments to your photos.

Upgrade From Mountain Lion To High Sierra

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