You cannot downgrade the TurboTax desktop editions.
If this is for tax year 2024 you could ask for a refund and then purchase the Deluxe desktop edition.
See this TurboTax support FAQ for a refund request - https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-refunds/request-refund-turbotax-p...
