In order to view a previous year return you would have needed to have used a Deluxe or Premier version of Turbo Tax last year. If you did not do that you can upgrade to a version of TurboTax this year that is not the free version.
I have included instructions on how to view and/or pay for the upgrade to access prior year returns.
https://ttlc.intuit.com/replies/3301525
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