HT4414 When I try to purchase Mountain Lion i get an error message:  "We could not complete your purchase.  The product distribution file could not be verified. It may be damaged or was not signed."  I can purchase other apps, why not Mountain Lion?

When I try to purchase Mountain Lion i get an error message:  "We could not complete your purchase.  The product distribution file could not be verified. It may be damaged or was not signed."
I can purchase other apps, why not Mountain Lion.   I get the same message on my wife's IMAC.

The only thing that worked for me was to boot in safe mode.
Power down.  Then press power button and hold 'shift' key until grey screen with progress bar appears... Once booted and logged in just open safari and browse to applestore. 
No trouble at all once I did this.
Hope it helps.

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