You are able to downgrade to a lower version if you
have not already paid for the version you are in, but you will have to use
the Clear & Start
Over feature to do that. See steps below for how to Clear
& Start Over https://ttlc.intuit.com/replies/4248526
NOTE: Keep
in mind that each version handles different
situations, so if you downgrade and your tax situation calls for more
than what that version handles, you will get prompt to upgrade again.
Other Related Information: