You can downgrade,
but each version of TurboTax is designed to handle different tax situations and
their associated forms.
While you’re welcome
to downgrade, you may miss some features—and you’ll be prompted to upgrade if
those features are needed.
To downgrade, please
see the TurboTax FAQ below to clear and start over.
Note: In TurboTax Online, you can erase your return
and start from scratch as long as you haven't submitted payment, deducted the
TurboTax fee from your refund, or registered.
https://ttlc.intuit.com/replies/4248526
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