When trying to update TurboTax 2005, I got TurboTax - Error 11002:2,-14 'An error prevented the update from completing'.
You've got to re-install the program to get around the error.
Plus, if you've had trouble updating to new forms, you might as well delete the following files too:
Library/Preferences/TurboTax 2005 Preferences/TurboTax 2005 Preferences
Some guy on the TurboTax message boards suggested it.