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Sep 11, 2012 10:15 PM in response to chovis0720by Carolyn Samit,Helps to tell us what the error said...
Try here > Mac App Store: "An unknown error occurred (100)" when purchasing
Might need to temporarily disable anti virus software.
FYI, third party download managers may cause issues when downloading apps including Mountain Lion.
Apps such as Net Nanny, Hands Off, and LIttle Snitch can prevent apps from downloading.
Make sure you are using the same Apple ID associated with your Mac.
Make sure you have the correct App Store country selected. Check the round flag icon bottom right corner of the App Store.