Error upgranding to mountain lion

Hi,
when trying to upgrade to 10.8 I'm not able to even download the upgrade. I always get a error message, saying, that a product distribution file is missing or not correctly signed.
Seems to be a problem of my iMac 27" 2.7 Ghz as I was able to buy on a different Mac with my Apple-ID. At home I still wasn't able to even download the product I paid for. Always the same error message.
Until now I've deleted all cache files and prefs, tried it as root and all the other known solutions :-(
Kind regards

I have been having the exact same problem
You should check for any anti-virus software or any firewalls and disable them
If that doesnt work try going to "store" > "Check For Unfinished Purchases"
That should fix the problem

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