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Upgrade to Mac OS X 10.7 (Lion)

Note: As with all operating system upgrades, please ensure you have a full backup of your system completed before beginning.


  • Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
  • Mac OS X v10.6.6 (Snow Leopard) or later (v10.6.8 recommended)
  • 7GB of available disk space
  • 2GB of RAM
  • Administrator account access


Installation can take 40 minutes or more to complete.
  1. Once you've downloaded Mac OS X 10.7 for installation, double-click the downloaded file titled Install Mac OS X Lion.
    Result: The file will verify, then open.

  2. Double-click the application labeled Install Mac OS X

  3. From the window labeled Install Mac OS X select the button labeled Continue.

  4. When presented with the license agreement, click Agree.

  5. Click Agree again from the slide-down screen.

  6. Select a drive to install Mac OS X Lion on and click Install.

  7. Enter the username and password for your user account when prompted and select OK.

  8. The application will now download installation files and restart your machine.

  9. Upon restart, Mac OS X Lion will begin installing. You cannot use your computer during this time (approximately 40 minutes).

  10. When the installation has completed, your computer will restart and you will be presented with the setup assistant for Lion.
    Result: Mac OS X Lion (10.7) has been successfully installed.

  11. Users should run Software Update immediately after installing Lion to be updated to 10.7.2.

For additional Lion documentation, visit the Lion landing page in the Knowledge Base.

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

May 05, 2016

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