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Resolve Mac App Store download issues by removing cache folder Apps
I've occasionally seen issues where Mac App Store downloads failed, with a message saying "The product distribution file could not be verified. It may be damaged or was not signed." Topher Kessler writing at CNET showed a way you can resolve this issue.

When this download problem occurs, it is generally the result of a corrupted file in a cache folder. If you run this command in Terminal:
open $TMPDIR../C/
a folder will open in the Finder showing a number of cache folders for different applications. Delete the com.apple.appstore folder, then quit and relaunch the App Store application and try the download again.
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Resolve Mac App Store download issues by removing cache folder
Authored by: heywoody on Oct 13, '12 06:49:19AM
I ran into a similar issue when I was trying to install XCode 4.4 on a clean (vs. upgrade) installation of Mountain Lion.

The MAS kept bombing out saying "Xcode can’t be installed on “Macintosh HD” because the version of OS X is too new"

https://discussions.apple.com/thread/4135803?tstart=0

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Resolve Mac App Store download issues by removing cache folder
Authored by: Tim.Lance on Oct 14, '12 12:16:17PM

Worked like a charm. :thumbsup:



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Resolve Mac App Store download issues by removing cache folder
Authored by: negritude on Oct 31, '13 12:29:31PM

This command also works to reveal the cache directory:

open `getconf DARWIN_USER_TEMP_DIR`



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