Iphoto/Imovie won't update after upgrade to Mavericks 10.9.5

After Mavericks upgrade, iPhoto won't work. Attempting to update it to 9.5.1 from the app store fails with "the product distribution file could not be verified. It may be damaged or was not signed. This is the case for iMovie update as well.
All attempts to remedy have turned up unsuccessful and a deep Google search didn't amount to much.
I tried to find/delete the file in /var/folders (which has worked before) but the console does not show a folder to delete, instead it shows a different error (attached)

Any help is greatly appreciated here.
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BeallsDesktopTeamAsked:
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strungCommented:
The error message you are showing seems to be an error in trying to update your Sophos anti-virus, not  iPhoto or iMovie.

Try disabling Sophos to see if that makes a difference.
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strungCommented:
There is a lengthy solution posted here:  https://discussions.apple.com/thread/2710174?start=30&tstart=0
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BeallsDesktopTeamAuthor Commented:
This worked after disabling Sophos and retrying. I never would have figured this out from the logs. Never saw Sophos interfere before but it surely did here.

Thanks,
Bealls Desktop Team
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