For tax year 2019 there is NO requirement to purchase any 2019 online edition, nor is there a requirement that you must file a 2019 tax return using the online editions before you can access to a prior year online return.
Choose the FREE version and then log in ... do not upgrade. https://turbotax.intuit.com/personal-taxes/online/
You only need to register the 2019 online account to access the prior year online tax returns.
See this TurboTax support FAQ for accessing prior year online tax returns - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...
