There was some news a little while ago about a new Airport Extreme coming later this year that would check Mac computers on the network and download updates they need, then push these updates to all computers at some point in day. This would be the perfect solution for those who wish to install OS X Lion onto multiple machines in the home or office.
This would save so much time, due to the fact that you have to download the update and install it to each device via the Mac App Store. However, there is a workaround, and will still appeal to those who do not wish to connect their Mac to a network, due to security reasons. The first solution is to wait until August, as Apple will be releasing a USB stick with Lion pre-installed, or you can create a bootup install DVD.
The first thing to remember in this process is to not install Lion first; you need to create the disc. If you do install it first then Lion will delete the installer image. The four things needed for this process are a blank DVD, a DVD burner and an Apple ID along with Mac App Store access.
There are now just 7 simple steps to follow, which Hot Tips Central has been able to provide. The first is to download OS X Lion on the Mac App Store, which you can find here. The next step is to find the installer once the OS has been downloaded, it should be in the Applications folder. Once you have found it then use the secondary click and select “Show Package Contents.”
Thirdly you will then need to look in the contents folder and search for a folder named “Shared Support.” Once you have opened this you will then come across “InstallESD.dmg”. You are now ready to proceed to the next step, copy that file you have just found to another location; this can be anywhere but the Desktop would be the best place.
You are now ready to create your DVD backup, the way to do this is by going to open Disk Utility, from there you will see a burn button at the top. Now the Disk Utility will ask for the location of the file that you wish to burn, so in this case you will select the Desktop and then select said file. By now you should already have that blank DVD in your drive; you are now ready for the final step. Press the burn button at the top; once done you will finally have your very own DVD install disc of OS X Lion. This will save you hours of downloading, but as we mentioned above, would be much simpler with a new version of the Airport Extreme.
Also See: iTunes 12.0.1 update release notes