Why do my purchased iTouch apps appear as “unpurchased” after upgrading to iOS 5 using a friend’s computer?

YozMan October 30, 2011
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I was backing up my apps on a friend’s computer before updating to iOS5. However, after I backed everything up it told me it couldn’t back up certain apps, because the computer was “unauthorized”, which is untrue because the computer was/is authorized. Now those apps don’t work on my iTouch, and they all appear as if they were not purchased in the App Store, only they were, in fact all the apps that don’t work cost me money! So I’m wondering is there anything I can do?

Thanks,
Yoz

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