If your current operating system is OS X Lion (10.7), you can skip a few versions, and upgrade directly to macOS High Sierra. To upgrade to Sierra from, say, Mavericks, you’ll have to consequently upgrade to Yosemite and then to El Capitan first. I resisted upgrading to El Capitan because of the negative comments about it, I just wondered about peoples experience of upgrading from OSX 10.8.5 (Mountain Lion I think) to MacOS Sierra? I feel that I should upgrade because of security issues. My main use is Safari, Mac email, Word, Excel and Preview. Upgrade to high sierra, still supported by apple for security patch and compatibility, no reason to stay on mountain lion wich is deprecated. Best upgrade is ssd, not ram, but you’ll need adapter 3.5’ to 2.5’ (icybox for example) and themal sensor (OWC).

OS X Mountain Lion (version 10.8) is the ninth major release of macOS, Apple Inc.' S desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, 2012 for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or so. UniBeast is a tool by MacMan and tonymacx86 to create a bootable USB drive from any Mac App Store purchased copy of Mac OS. This all-in-one bootable USB drive can also be used as a rescue boot drive for system recovery. Support Note: UniBeast 8. MacOS High Sierra (variant 10.13) is the fourteenth vital appearance in Apple Inc’s. MacOS franchise for MacBooks and Macintosh PCs. This time around Apple has radically improved the process that the macOS runs to organise your data, as well as there is an added support for stored photos, sounds, images, and video codecs which mean to meet your progressive data needs, by occupying. Use About This Mac to see the version of Mac operating system installed on your Mac, and find out whether it's the latest version.

Upgrade to macOS Big Sur

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

  • If you are running Lion (version 10.7. 5), Mountain Lion, Mavericks, Yosemite, or El Capitan, you can upgrade directly from one of those versions to Sierra. Post navigation FAQ: How Does The Author Use The Introduction In The Way To Rainy Mountain?
  • Tried and failed to upgrade my hackintosh from mountain lion to high sierra I have very limited knowledge at this and just about managed to set it up years ago, I am really trying though so any help will be much appreciated. Ill run through what I did, sorry its long I tried to keep it clear as possible.

Check compatibility

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

View compatible Mac models

Make a backup

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

Learn how to back up your Mac

Upgrade Mountain Lion To High Sierra

Free up space

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

Free up storage space

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.

Learn how to download and install macOS Big SurGo to the App Store

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.

Use Control Center

Notification Center

Notification Center puts notifications and>

Safari

Upgrade From Mountain Lion To Sierra

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.

Get to know Safari

Maps

How To Upgrade Mountain Lion To High Sierra

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

Lion

Messages

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.

Use MessagesLearn more on YouTube

Photos

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

Learn how to edit your photos

Have a question?

Ask everyone. Our Apple Support Community can help you find answers.

Upgrade From Mountain Lion To High Sierra

Ask now

Mac Mountain Lion To High Sierra

Tell us how we can help

Upgrade Mountain Lion To High Sierra

Answer a few questions and we'll help you find a solution.

Get support

Upgrade to macOS Big Sur

Update From Mountain Lion To Mavericks

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.

View compatible Mac models

Make a backup

  • Since releasing the final update to OS X Lion, Apple has released a number of major updates to their operating system. Lion was followed by the release of version 10.8, named Mountain Lion. Apple is now on version 10.13, called High Sierra, and now referes to their operating system as macOS instead of OS X.
  • Supports Apple Mac OS X Lion 10.7 / Mountain Lion 10.8 / Mavericks 10.9 / Yosemite 10.10 / El Capitan 10.11 / Sierra 10.12 51.59 Mb dLive Director V1.31 for Windows.

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

Can i upgrade from mountain lion to sierraLearn how to back up your Mac

Upgrade Macos Mountain Lion To Mavericks

OS X Mountain Lion (version 10.8) is the ninth major release of macOS, Apple Inc.' S desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, 2012 for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or so.

Free up space

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

Free up storage space

Download macOS Big Sur

Upgrade From Mountain Lion To Sierra

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.

Learn how to download and install macOS Big SurGo to the App Store

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.

Use Control Center

Notification Center

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.

Get to know Safari

Maps

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

Messages

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.

Use MessagesLearn more on YouTube

Photos

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

Learn how to edit your photos

Have a question?

Ask everyone. Our Apple Support Community can help you find answers.

Ask now

Tell us how we can help

Answer a few questions and we'll help you find a solution.

Get support

To get the latest features and maintain the security, stability, compatibility and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Learn how to upgrade to macOS Big Sur, the latest version of macOS.

Check compatibility

If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.

Update Os X Mountain Lion To Mavericks

Upgrade From Mountain Lion To Sierra

To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini or Mac Pro.

Make a backup

Can You Upgrade From Mountain Lion To High Sierra

Mountain Lion To Mavericks

Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Upgrade

Download macOS

How Do I Upgrade From Mountain Lion To Mavericks

It takes time to download and install macOS, so make sure you're plugged into AC power and have a reliable internet connection.

Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.

  • macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite or Mavericks
  • macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks or Mountain Lion
  • macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks or Mountain Lion

Upgrade Mac Mountain Lion To Maverick

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to start installing the operating system.

  • macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion or Lion
  • OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion or Snow Leopard
  • OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion or Snow Leopard

Install macOS

Follow the onscreen instructions in the installer. It might be easiest to start the installation in the evening so that it can be completed overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Please allow the installation to be completed without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar or show a blank screen several times while it installs macOS and related firmware updates.

Update Mountain Lion To Mavericks

Learn more

You might also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS or install the macOS that came with your Mac.