Download Mountain Lion an error has occured

I have a MBP early 2008 with 4GB Memory and 30GB free disk space.
So I know I can upgrade.
I have purchased Mountain Lion in the appstore but it will not download.
The download starts and gets to 79.34MB and then gives an error:
"an error has occured"
I have tried deleteing the appstore cache, logging out and quiting the appstore and then starting the appstore and logging back in, but none of it has helped.
Everytime it fails at exactly 79.34MB.
It is driving me mad, I hope someone can help.

-  Temporarily disable anti virus software if installed.
-  Apps such as Little Snitch, Net Nanny, and Hands Off can prevent apps from downloading including Mountain Lion.
-  Third party download managers are not compatible with the App Store.
For downloading Mountain Lion from the App Store, a high speed (broadband) internet connection is strongly recommended by Apple as noted here > iTUNES STORE - MAC APP STORE - TERMS AND CONDITIONS
Keep in mind, If you need to reinstall OS X or repair the the startup disk using Mountain Lion Recovery, that requires broadband (high speed) access to the internet via Wi-Fi or an Ethernet connection. OS X is downloaded over the internet form Apple when OS X Recovery is used for reinstallation.
Mountain Lion is a 4.34GB file. If you are using a slow internet connection, the download may be timing out before it can finish. Your ISP determines your download speeds. Check with your ISP for upgrade options.

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