Preflight File

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?
"Failed to verify the preflight file. It is not signed by Apple."
Downloaded Mavericks last night, and now I'm experiencing this problem.

Hello mgmccomy,
You might consider creating a test administrator account on the computer and attempting the updates there.
The first and easiest test to try is to see if the issue affects a different user account on your Mac. Each user account has customized preferences and other items stored in its home directory. You'll first need to create an additional user if one does not already exist (follow steps a-h below). Then, log out of the current user and test the issue in the new user account.
If this resolves the issue, there may be an issue with a file in the home directory of the original user account.
From the Apple menu, choose System Preferences.
From the View menu, choose Accounts (or choose Users if using Mac OS X v10.2 or earlier).
Click "+" (or click New User if using Mac OS X v10.2 or earlier).
Give the new user a name and short name.
Mac OS X v10.3 or earlier only: Click the Password tab, and give the user a password.
Mac OS X v10.3 or earlier only: Click Security.
Select the checkbox for "Allow user to administer this computer". This makes the user account an administrator.
Click OK, or quit System Preferences.
Mac OS X: How to troubleshoot a software issue
http://support.apple.com/kb/HT1199
Cheers,
Allen

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Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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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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Hello mgmccomy,
You might consider creating a test administrator account on the computer and attempting the updates there.
The first and easiest test to try is to see if the issue affects a different user account on your Mac. Each user account has customized preferences and other items stored in its home directory. You'll first need to create an additional user if one does not already exist (follow steps a-h below). Then, log out of the current user and test the issue in the new user account.
If this resolves the issue, there may be an issue with a file in the home directory of the original user account.
From the Apple menu, choose System Preferences.
From the View menu, choose Accounts (or choose Users if using Mac OS X v10.2 or earlier).
Click "+" (or click New User if using Mac OS X v10.2 or earlier).
Give the new user a name and short name.
Mac OS X v10.3 or earlier only: Click the Password tab, and give the user a password.
Mac OS X v10.3 or earlier only: Click Security.
Select the checkbox for "Allow user to administer this computer". This makes the user account an administrator.
Click OK, or quit System Preferences.
Mac OS X: How to troubleshoot a software issue
http://support.apple.com/kb/HT1199
Cheers,
Allen

I cannot get my App Store to work. It says "Failed to verify the preflight file. It is not signed by Apple." How do I resolve this?

When I upgraded to Mavericks the other day, I lost functionality of Mac App Store. It worked fine in Mountain Lion.
Please help!

Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
From the menu bar, select
Keychain Access ▹ Preferences ▹ Certificates
There are three menus in the window. Change the selection in the top two to Best attempt, and in the bottom one to CRL. Log out, log back in, and test.

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Yes I was/am aware of Preflight's inability to play nicely over cloud technologies in certain cases, especially wrt Standards technologies, this will be partially addressed in an upcoming version of Preflight without saying too much. But the same thing could theoretically have happened if the file was also located on another local network client or server. Leaving aside the argument that this may violate the Acrobat User Agreement - since purchasing the software, the user agrees to employ its functionality on a single host system and precludes host-client-based scenarios - this simply is not a supported use, meaning the user may not have expectations that it will work at all, if the applications requirements are not observed. There do exist server-solutions for Preflight files within networks, but Acrobat and by extension Acrobat Preflight is not one of those solutions, and (still) belongs in the single host-based desktop environment.
However most (99.9%) functions within Acrobat <-> acrobat.com file exchange are supported, file syncing across multiple devices will soon be supported, but Standards compliance is still admittedly a problem at this point. Some testing has been done using 3rd party cloud technologies starting with enterprise-based solutions, such as Office 365, and this will continue to ramp up to include other 3rd party products.
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I updated to Mavericks and now the app store is saying I have an update for iphoto. I cannot get the update, I am getting this error message " failed to verify preflight file. It is not signed by apple". Is there spmethign that I am missing? I tried to donload the update 9.4.3 and when I attempt to install the update I am getting a message that says iphoto has to be updated through the app store. Any ideas ?

I solved this problem from a post I read on another thread (can't remember how I got there). Here are the steps that fixed it for me:
Close App Store
Go to Keychain Access, Preferences, Certificates tab
Change the OCSP and CRL to "best attempt"
Exit Preferences and then Keychain access
Restart (this may not be necessary, but it the next step I took)
Launch App Store, Purchases, Click on the one that would not install before - good luck
For me, it was iPhoto and iMovie, but I later discovered that no app would download, even new ones from under "Featured". I also updraded a Mac Pro last night with Mavericks and it did not have this problem. In checking later, I discovered that these preferences were already set as described above.

Preflight File

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