Os x mountain lion, i got the message "hash mismatch", the icon then disappeared.

I was downloading the os x mountain lion, i then got the message that download is interrupted hash mismatch. i restarted my macbook, then the mountain lion icon disappeared from the purchased item list in my app store. however, it is shown that i have purchased it in the purchase history.
please help.

http://www.apple.com/support/mac/app-store/contact

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