I don't believe there is any way to do that within the program. You would have to log into TurboTax and download the original program again, like when you originally downloaded it. Look for Products and Billing:
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There is a way to have 2 licenses. Under Help - Switch Product - Activate new product. But I don’t think Deluxe will be much different than Premier. Premier just has more help for investments. What trouble did you have with Premier?