Product Distribution File Could Not be Verified- solution?

Hello All-
Mountain Lion downloaded just fine on my 2011 Macbook Air. But on my mid-2010 iMac, I am getting the dreaded "We Could Not Complete Your Purchase"....The Product Distribution file could not be verified.
I've deauthorized and deleted Intego apps from my machine, I've removed the Appstore cache files and containtaing folders, I've restarted multiple times, and I've stood on one leg and rubbed my tummy while clicking the "Download" button....but nothing seems to work. I continue to get the error message.
Any other ideas or solutions out there? I know it's not the computer, as I've been able to buy and download other App store apps...just not Mountain Lion.
Thanks!

But on my mid-2010 iMac, I am getting the dreaded "We Could Not Complete Your Purchase"....The Product Distribution file could not be verified.
Which Mac OS X is currently installed on the iMac ??
Try installing the appropriate combo update ..
For Snow Leopard > Mac OS X 10.6.8 Update Combo
For Lion > OS X Lion Update 10.7.4 (Client Combo)
Restart your Mac after installing the combo then try downloading Mountain Lion.
If the Download button isn't available, try it this way.
How to re download apps from the Mac App Store:
Open the App Store. From the menu bar click Store > Sign In
Click Purchases from the top of the App Store window.
Select Mountain Lion. Then right or control click where you see Installed then click Install.
Make sure and use the same Apple ID used for the original purchase. You won't be charged again.

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