I can not download mac os x mountain lion in the apple store

¿No puedo descargar mac os x mountain lion de la apple store, ¿Que hago?
La mac app store dice: "No se ha podido verificar el archivo de distribución del producto. Puede que esté dañado o que no esté firmado."
I can not download mac os x mountain lion in the apple store, what should I do? The mac app store says: "Unable to verify file distribution. May be damaged or not signed."

Carolyn Samit San Francisco Bay Area / Hawaii
Re: i have tried to up date my OS to mountain lion but i get this messageThe product distribution file could not be verified. It may be damaged or was not signed. Aug 7, 2012 1:24 AM (in response to LiverpoolAdam)
Quit the App Store if it's open.
Open the Finder. From the Finder menu bar top of your screen click Go > Go to Folder
Type this exactly as you see it here:
/Library/Preferences/SystemConfiguration
Click Go then move the NetworkInterfaces.plist file from the SystemConfiguration folder to the Trash.
Relaunch the App Store and try downloading Mountain Lion.

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