Failed to verify preflight file

I consistently get this message after upgrading to Mavericks when attempting updates of Apple software (eg iMovie, iPhoto, etc)  in App Store:  "Failed to verify the preflight file. It is not signed by Apple."  Can anyone help me get past this message and update my software?

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    What worked for me was changing the certificate preferences in Keychain Access (open Keychain Access app and then go to preferences).
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  • PREFLIGHT FILES NOT SIGNED BY APPLE

    HAVING TROUBLE INSTALLING UPDATES & DOWNLOADS FROM THE APP STORE.  I GET A MESSAGE FAILED TO VERIFY PREFLIGHT FILES  NOT SIGNED BY APPLE. 
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  • I try to purchase pages (after upgrading to maverick) and get this message: Failed to verify the preflight file. It is not signed by Apple.

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    Back up all data.
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  • Failed to verify the preflight file. It is not signed by Apple.

    This morning I was able to download iMovie, iPhoto and iBook Aurhor without getting this error: Failed to verify the preflight file. It is not signed by Apple.
    However I am still getting this error when trying to update Numbers, Keynote, Pages and Aperture 3.5. I am starting to think this all maybe caused by a server overload with Apple.
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    Hi William,
    What worked for me was changing the certificate preferences in Keychain Access (open Keychain Access app and then go to preferences).
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  • Getting "We could not complete your update. Failed to verify the preflight file..."

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    Similar threads solve this problem by either creating a new administrator identity, which allows one to update applications, or changing the keychain prefs to Best attempt.  My issue was solved by adding a new admin user, and then updating the apps from the App store using the new identity.  Under my orginal user identity the keychain app would crash when I attempted to open Prefs.  After creating a new identity and updating the applications (iPhoto, etc) I found I was able to open the keychain Prefs logged into my orginal identity.

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    Similar threads solve this problem by either creating a new administrator identity, which allows one to update applications, or changing the keychain prefs to Best attempt.  My issue was solved by adding a new admin user, and then updating the apps from the App store using the new identity.  Under my orginal user identity the keychain app would crash when I attempted to open Prefs.  After creating a new identity and updating the applications (iPhoto, etc) I found I was able to open the keychain Prefs logged into my orginal identity.

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    Can anyone tell me what the Preflight File is, how to obtain it, how to get it signed by Apple, and why I'm getting error when I attempt to update any software application from the App Store?
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    Downloaded Mavericks last night, and now I'm experiencing this problem.

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    http://support.apple.com/kb/HT1199
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