|Note: As with all operating system upgrades, please ensure you have completed a full backup of your system (using a service such as CrashPlan PROe) before beginning.|
|Note: Make sure that FileVault 2 is disabled on your on your machine, since this can cause problems with the upgrade after a restart.|
|Note: OS X Mountain (10.8) is no longer available via the Software Grid, users will have to download a copy through another source.|
- OS X 10.6.8 (Snow Leopard) or later
- 8 GB of available disk space
- 2 GB of RAM
- Administrator account access
- iMac (Mid 2007 or newer)
- MacBook (Late 2008 Aluminum, or Early 2009 or newer)
- MacBook Pro (Mid/Late 2007 or newer)
- Xserve (Early 2009)
- MacBook Air (Late 2008 or newer)
- Mac mini (Early 2009 or newer)
- Mac Pro (Early 2008 or newer)
|Installation can take 40 minutes or more to complete|
- Once you've downloaded OS X 10.8 for installation, find and double-click the downloaded disk image file.
Result: The file will verify, then open.
- Double-click the application labeled Install OS X Mountain Lion.
- From the window labeled Install OS X select the button labeled Continue.
- When presented with the license agreement, click Agree.
- Click Agree again from the slide-down screen.
- Select a drive to install OS X Mountain Lion on (if you only have one disk available on your Mac, you don't have to select anything) and click Install.
- Enter the username and password for your user account when prompted and select OK.
- The application will now download the installation files.
- Once these files have been downloaded, you can either click Restart to restart your Mac or it will restart automatically after a set period of time.
- Upon restart, OS X Mountain Lion will begin installing. You cannot use your computer during this time.
- When the installation has completed, your computer will automatically restart.
Result: OS X Mountain Lion (10.8) has been successfully installed.
To learn what's new in OS X Mountain Lion, visit Apple's Mountain Lion page.
For additional Mountain Lion documentation, visit the Mountain Lion landing page in the Knowledge Base.