Trying to download mountain lion, but download stoped at 79.34MB and will not restart

How can I get apple to let me download it again, as they have billed me for it already even though its not downloaded.

Thanks for your responce, ram not a problem I have 16Gig and HD has 79GIG available, the appstore application would not let me down load again as it looks like it's still downloading.
I have done a restart om my Mac and started the download again however once again stoped at 79.34MG of 4.37GB-Calculating...
I guess this is a Local problem for me as this App (OSX) will be purchased regulaly and this problem would have come up before. 
Any other suggestions?

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