Yes to downgrade you have to clear and start over. So you will lose all your work so far.
In the Turbo Tax Free Edition, information that you can enter is limited now. Why do I have to upgrade from the Free Edition?
https://ttlc.intuit.com/community/upgrading/help/why-do-i-have-to-upgrade-from-free-edition/00/26379
Or go to the IRS Free File programs
Free File: Do your Federal Taxes for Free | Internal Revenue Service
Or if it doesn't let you clear and you haven't paid and filed you could just start a new account. Online is only good for 1 return per account. But you can use the same email address for 5 accounts. How to start another return in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
If you got upgraded to a higher version and want to use a lower version without losing your entries, one thing you can do is move your Online file to a lower Desktop program and continue without paying for Online or needing to reenter your info. All the Desktop programs have the same forms. You just get more help and guidance in the higher versions. Plus the Desktop programs have several more features over online.
