No. Unfortunately, there is no way to downgrade a TurboTax return. You would need to create a new return to go back to the original product. 

To start a new return, select “Start a New Return” from under “My Returns” in the top left corner. Once you have started your new return, you can select “View All Returns” from under “My Accounts & Returns”. Then delete the unwanted return by clicking the small Trash Can next to it or “Delete” under the return’s name.

Ok, got it. Is there any way of copying my profile information and any other additional information from the return I started to the new return under Turbo Tax Premier?

Unfortunately, short of taking screenshots, this is not possible.

Thank you for choosing TurboTax.