Trying to download free upgrade get this message: "The product distribution file could not be verified. It may be damaged or was not signed." Please pelp

I tried to download the upgrade and it started, but I think my connection was spotty because then it stopped and when I tried to redownload that is the message that keeps popping up.  Also I bought the computer in America in July, but am now living in Japan.  Not sure if that makes any difference whatsoever, but I figured as much info as I could give would help.  I appreciate any advice.

Try this...
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 downloaing Mountain Lion.
Might also need to disable anti virus software and turn off the Firewall in System Preferences > Security & Privacy > Firewall.

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    Test while in safe mode. Same problem?
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