How to install Lion or Mountain Lion on multiple computers

Summary

If you've purchased OS X Lion or Mountain Lion from the Mac App Store, you're allowed to install it on all of your personal authorized Macs.

Products Affected

OS X Lion, OS X Mountain Lion

To install OS X Lion or Mountain Lion on another Mac, open the Mac App Store, sign in to your account, and re-download the OS by selecting it in the Purchases list. Follow these steps:

  1. Download Lion or Mountain Lion from the Mac App Store on one of your personal authorized Macs. The download is approximately 4 GB in size.
  2. Install the OS. 
  3. Log in to another computer that you wish to install it on. 
  4. Open the Mac App Store. Enter your Apple ID and password that was used to download either Lion or Mountain Lion on the first computer.
  5. Click the Purchased icon, then click the download link for the appropriate OS. 
  6. Run the Installer once it has finished downloading to the new Mac. 
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