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I bought the iBoostUp app when I was using Lion, and one day it suddenly stopped working, I uninstalled it, and yesterday I got Mountain Lion hoping that it would get magically fixed, but it didn't. Any clues on how to restore the app?

“iBoostUp” is damaged and can’t be opened. Delete “iBoostUp” and download it again from the App Store!

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Have you tried re-downloading it from the App Store as suggested? –  jtbandes Jul 28 '12 at 3:51
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4 Answers

I have received the same "[Application] is damaged and can’t be opened." error when trying to run unsigned applications in Mountain Lion. Notably Davmail.

Try the "Allow applications downloaded from: Anywhere" setting in the "Security & Privacy" System Preferences pane :

Security & Privacy

For whatever reason you may be running an old, unsigned version of the app.

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No, this will not solve the problem. The error message states the app is damaged, not that it's unsigned. –  Zr40 Jul 28 '12 at 8:07
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I had the same message for a signing problem, sadly you cannot always rely on the correctness of error messages. –  Tyr Jul 28 '12 at 13:06
    
Had a similar problem with a jar-bundled Java app. This solved it. The "damaged" message is simply wrong. –  Clayton Mar 14 '13 at 15:33
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From their FAQ:

iBoostUp fails to launch after an update with error "iBoostUp is damaged and can't be opened" We've had intermittent reports of this occurring with our 3.1 and 3.2 updates. This issue is not specific to iBoostUp and related to a problem with the App Store itself. To resolve, please: Remove iBoostUp from your Applications Remove com.ituneup.ituneup.plist and com.ituneup.ituneup.plist.lockfile from ~/Library/Preferences Download iBoostUp from the Mac App Store

In case you are unable to locate the above-mentioned files please try the following: Open Terminal.app from Applications -> Utilities Type "rm ~/Library/Preferences/com.ituneup.*" without quotes and then hit [enter] Re-download iBoostUp again from the app store.

To re-enable any of your previous purchases please follow the steps in FAQ entry #12

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For a similar problem, with the (Java) application Sawmill, it was sufficient to "Allow applications downloaded from: Anywhere." I got the "damaged" error when I tried to run it; then I changed that setting to Anywhere; and now I don't get that error anymore. Looks like a bug in Mountain Lion, sort of: the error message could be a lot better, e.g., something saying that Security & Privacy settings disallow that application. Anyway, thanks for the suggestions; it worked.

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In Terminal, run "xattr -rc /Volumes/Application.app", that should fix it (naturally, replace "/Volumes/Application.app" with your actual application path. No need to disable GateKeeper.

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This worked for me with DrJava.app –  Paul Gregory Oct 30 '13 at 15:30
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