Mountain Lion download not working on my MBA.

Hi,
I am hoping that someone can help me with this.
I am trying to download onto my MBA - Mountain Lion. I have successfully downloaded onto my iMac. When in the App store - Downloads it says,  "The product distribution file could not be verified. It may be damaged or was not signed."
Help!

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
Move the NetworkInterfaces.plist file from the SystemConfiguration folder to the Trash.
Relaunch the App Store and try downloading Mountain Lion.
If that doesn't help, disable anti virus software and try turning off the Firewall in System Preferences > Security & Privay > Firewall
If nothing above has helped, install the appropriate combo update.
For Lion v10.7 >  OS X Lion Update 10.7.4 (Client Combo)
For Snow Leopard > 10.6 > Mac OS X 10.6.8 Update Combo
The combo will reintsall the App Store for you which may help. Restart your Mac after the combo is installed. Try downloading Mountain Lion.

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    Type this exactly as you see it here:
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    Click Go
    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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    If nothing above has helped, install the appropriate combo update.
    For Lion v10.7 >  OS X Lion Update 10.7.4 (Client Combo)
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