Is there a way prevent multiple downloads of iphone update

I have an imac with 4 user profiles and 4 iphones tied to itunes (one in each profile).  When there is an update to the iphone, each profile has to download the update.  Is there a way to share the update between the profiles to prevent having to download the update 4 different time?

When you update the first one, you can save the *.ipsw (it will be in your users home directory in \Library\iTunes\iphone software update) and use it for updating from a local file for the others.  Ordinarily, the ipsw is deleted once the update has been installed, so once the download is complete, and the device is restarting, go and copy it somewhere else before the cleanup script purges it.
Or, you can update those other devices over the air via wifi - the over the air update is MUCH smaller (iOS 7.0.6 on my iPhone 5 and iPad 4 was about 13.3MB-13.6MB).  The over the air update just includes the updated material, while the iTunes update includes everything for all previous updates as well (it is the equivalent of the OS X combo-updaters).

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