Launch the installer and upgrade to Mac OS X Lion.Copy the “Install Mac OS X.app” file directly into the recipient Macs /Applications folder.Disconnect the external drive from the source Mac and plug it into the recipient Mac(s).Plug the external drive into the Mac and copy the install file over.Open /Applications/ and locate “Install Mac OS X.app” on the source Mac.This is the easiest method but requires access to either an external hard drive, blank DVD, or USB flash drive, each need at least 4.2GB of available storage capacity. Method 1) Copy OS X Lion Installer to an External Drive Important: Make sure you copy the Lion installer app from /Applications prior to upgrading the primary Mac to Lion, once you have upgraded to Lion the installation file gets removed and you will need to re-download the file from the App Store. This is not a clean install (use the above boot drive methods for that), this is an upgrade to 10.7, be sure to have backups of all your Macs to be safe. Note that the OS X Lion system requirements still apply, and the target Macs will need to be running Mac OS X 10.6.6 or higher.
Installing or Upgrading Mac OS X Lion on Multiple Macs
This allows for easy upgrades of all your Macs and prevents you from having to re-download the app or create any installation drives. Several of these we have already covered before and you are welcome to check those out, but for the purpose of this article we are going to discuss transferring the OS X Lion installer to the other Macs. Downloading Lion again from the App Store on each Mac (it is free to re-download after you have bought it once).Transferring the Lion installer over a network.Copying the Lion installer with an external drive or DVD.Copying the OS X Lion installer to other Macs – this is the primary focus of this article by using the following methods.There are several approaches to installing OS X Lion on all of your own Macs, these include:
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