Seems like they have changed things again ... to access prior year returns you must ONLY REGISTER the 2019 account ... upgrading and paying for PLUS are no longer needed ...

How do I access a prior year return?

You’ll need to register first if you don’t already have access to your prior year returns under Your tax returns & documents as you sign in to TurboTax.

Before starting, make sure you’re using the same TurboTax account (with the same username) as previous years.

To access:

1. Choose TurboTax Free Edition when starting if you haven't already done so.
2. Follow the screens and provide some personal info. 
3. When you’ve reached the Personal info summaryscreen, select Continue.
4. Then, select Filein the left-hand menu (this is just a step in order to register, you won’t actually be filing).
5. Continue until you get to Review your orderand select Start.
6. Select View payment options.
7. Then continue until you get to the registration screen.
8. Enter your info and select Register, then Continue.
9. Go to Tax Homein the left-hand menu.
10. Under Your tax returns & documents, go toDownload/print return (PDF) (select Show if not visible).

Related Information:

• Why can't I find my return in Tax Home or My Docs™?
• Forgot your TurboTax Online User ID or password?
• Account Recovery Request for your TurboTax Account
• How do I get a copy of a return I filed this year in TurboTax Online?