When I try to install an iTunes upgrade I get this message: The following install step failed: run preupgrade script for AppleMobileDevice Support.

When I try to install upgrades for itunes on my Mac, I get the following message: The following install step failed: run preupgrade script for AppleMobileDevice Support.  When this happened before I trashed itunes and started over, but I don't want to have to do that everytime i install an upgrade.

C,
I ran into the same issue. Make sure your apple device in disconnected from the computer. It interrupts the itunes download. Disconnect and make sure itunes is closed, then try installing again. Remember that even though you close of itunes, it is often still running in the background. To make sure it's closed, click and hold the mouse on the itunes icon and select quit from the drop down menu. Then try installing the updated itunes.
Hope that helps.
SoEreal

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