Downloading Mountain Lion upgrade from App Store failed

I'm upgrading my wife's iMac from Snow Leopard 10.6.8 to Mountain Lion. Just tried to download the Mountain Lion upgrade from the App Store. I paid for it, clicked on the download, the little icon did it's fancy leap down to the application bar at the bottom of the page, and the item in the app store said it was downloading as well as the white bar beneath the icon in the app bar at the bottom of the screen. Nothing happened. I left the computer and came back about ten minutes later. The app store had crashed. Rebooted it. Tried the download process again. Same result.
I paid about $20 for the system software upgrade so I would like, if possible, to use the app store item if I can. Is there a solution without a trip to the Apple Store to buy the system upgrade?
John Kendrick

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.

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