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.
- You REALLY want to upgrade your hardware first. The stock 2011 MBP has 4GB RAM and a weedy little 5400RPM hard drive. Do yourself a big favor and drop.
- For OS X versions from Lion up to El Capitan. I successfully re-tested this method Jan 2019 - still working as stated for a Mac limited to El Capitan. Purchased older OSes are still listed & accessible. The simplest way - if available to you - is to use your Purchase History on the App Store.
- OS X Version: Mountain Lion (10.8), most models. Mavericks (10.9) or higher — all models. How to check it: Click the Apple icon at the top left of your screen. Select 'About This Mac.' The number underneath 'OS X' is your version number. If you're running a version of OS X older than 10.8, look into upgrading your OS X.
- Right now, the newest iteration of OS X is 10.11, known as El Capitan. Previous versions include 10.10 (Yosemite), 10.9 (Mavericks), 10.8 (Mountain Lion), 10.7 (Lion), and 10.6 (Snow Leopard). There are multiple ways to install each version of Mac OS X on your PC; we've written guides for a few of them and listed them below.
Learn how to upgrade to macOS Big Sur, the latest version of macOS.
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Check compatibility
The version of macOS that came with your Mac is the earliest version it can use. For example, if your Mac came with macOS Big Sur, it will not accept installation of macOS Catalina or earlier.
If a macOS can't be used on your Mac, the App Store or installer will let you know. For example, it may say that it's not compatible with this device or it's too old to be opened on this version of macOS. To confirm compatibility before downloading, check the minimum hardware requirements:
- macOS Catalina 10.15 hardware requirements
- macOS Mojave 10.14 hardware requirements
- macOS High Sierra 10.13 hardware requirements
- macOS Sierra 10.12 hardware requirements
- OS X El Capitan 10.11 hardware requirements
- OS X Yosemite 10.10 hardware requirements
Download macOS using Safari on your Mac
Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer will open 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
Safari will download 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 will install 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
I have a late 2009 iMac with a 3.06 GHz Intel Core 2 Duo processor. I am running OS X Lion 10.7.5 and would like to upgrade to OS X El Capitan. When I try to purchase OS X El Capitan 10.11.6 via the App Store, I receive the following msg from App Store: 'We could not complete your purchase. This version of OS X 10.11 cannot be installed on this computer.'
I have >420 GB memory available on my hard drive and El Cap 10.11.6 only requires >6 GB.
The App Store info about El Cap 10.11.6 says 'Compatibility: OS X 10.6.8 or later', so my iMac should be compatible with this OS X.
Mac Os X Mountain Lion Upgrade To El Capitan Install Problems
Do I need to first upgrade to a different OS X? Which OS X?