I can't download mountain lion, I get the following message "could not complete your purchase, can't verify the file, it may be damaged or unsigned" ? what do i have to do ?

I can't download mountain lion, I get the following message "could not complete your purchase, can't verify the file, it may be damaged or unsigned" ? what do i have to do ?

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.
Reminder: create full backup before you upgrade OS
Hope it helps.

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