You can downgrade using the clear and start over feature. However, you will be required to restart your return. Please keep in mind that our various TurboTax programs handle different tax situations and their associated forms.
In order to clear your return and select a different TurboTax edition follow these steps:
1. Sign in and select continue my return
2. Select My account and click on Clear and Start Over
3. It will ask if you are sure you want to clear you return? If you want to clear your return click yes this will start your tax process all over.
4. Start a new return with the correct edition of TurboTax selected.
In order to downgrade you may need to Clear & Start Over.
You can attempt to Clear & Start Over if you have not already registered the product.
https://ttlc.intuit.com/replies/4248526
Once you've cleared your return you should be brought back to the original screen that says, "Hi, ______! This is what we got you last year, lets start your 2016 return!"
Under this section is a hyperlink that
says, "see other products". You'll want to choose this. If you start for
free, and have information pulled in from last year, you'll be upgraded
to our PLUS Benefits program. You can avoid this by letting it run its
course and clicking continue once everything is in. After you click
continue you'll want to select that you do not want to include this and
you'd like to Start For Free.
If you are not able to Clear & Start Over, you can abandon the return you're already in and go to our Freedom Edition. You only have to qualify for one of the prerequisites to use the program.
https://ttlc.intuit.com/replies/3301359