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I received "an internal error has occurred" message. error code TT600. I tried to restart the program but will not restart!

@kbm16 If you buy TurboTax from Costco or another 3rd party online retailer, then the email you get will come from them, not us. So you would have to contact Costco customer support to see why the have not responded to your emails or why they have put that email address there if they don't reply to it.