Trying to download mountain lion but keep gett msg that says hash mismatch?

i keep trying to down the mountail lion app but it will not finish before i get this msg

Hi I have tried to do it both by wifi or via the router; and I still have the same message Hash Mismatch.
I start to run out of ideas...
I have got a macbook 13'' white that I bought in 2009
My system is Mac OS Lion 10.7.4
Please helppppppp
Cheers

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Trying to download mountain lion but keep gett msg that says hash mismatch?

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