Mountain Lion download problem

I have been trying to download Mountain Lion for about 5 hours now and I keep getting errors saying the download cannot be completed. The last error I recieved was The download could not be completed becasue of a Hash Mismatch Error.
A download of about 4GB of data on my Internet Connection would usually take about 1 hour.
If I do get to succesfully download the Installer will the Installation begin automatically or is it started manually. I would prefer manually so I can make a backup copy first.
Christo
I am on a Late 2011 13' Macbook Pro, OsX 10.7.5

Contacted Apple Store Tech support requesting a solution. I received a reply from a gentleman telling me his area of expertise and that this problems didn't fit in his area of expertise and suggested I look on online forums and the like for a solution!!
All I have found out is this is a very common problem
Thanks for http://www.apple.com/support/mac/app-store/contact.html?form=account. Have not received a reply from Apple after 48 Hours.
I have tried:
Logging out and back onto the Online Store
Deleting the Apple Store cache on my HD
Connecting via an Ethernet cable instead of WI-FI
Using my iPhone 3G Data, teathered
Connecting via a totally different network
Restarting, restarting, restarting...
Nothing has worked. And still no solutions from Apple. I kinda of thought they might have suggested I go into a real Apple store and have them put a copy on my Mac or something.

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