I just updated to itunes 10.4.1 and now my mac doesn't open itunes

and it keeps saying install failed, run preupgrade script for applemobiledevicesupport. contact the software manufacturer for spport. ahh help!

warren.b.paul wrote:
So, I have managed to fix the problem.
I found that the upgrade had replaced my library files with empty ones.
So I restored the backup I made of them before the upgrade and
now all my media is back.
Great..
For those who run across this therad and haven't taken the effort to make a backup here is another approach that should work.
Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
See iTunes Folder Watch for a tool to catch up with any changes since the backup file was created.
When you get it all working make a backup!
tt2

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Tolepainter wrote:
You are a genius!,
No - but thanks! I read about the fix here on the discussion site. I'm glad it got your apps working again.
From the Apple kb article about troubleshooting app store issues ....
If all user-installed apps are not launching, it could be an Apple ID authorization issue. Download and install an app that isn't already installed on your device to reset this information.
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http://support.apple.com/kb/ht4097
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mozzrich wrote:
Thanks for your comments but this doesn't help my situation at all.
Again Apple fails to provide backward support for its own products.
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Diavonex
This helped meRe: Just updated my iPad 2 to ios7 and now my screen resolution is terrible... Jan 4, 2014 10:50 PM (in response to Batsy2000)
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I just updated to itunes 10.4.1 and now my mac doesn't open itunes

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