Sorry you can no longer use Turbo Tax to prepare or amend a 2019 return. Not Online and not using the Desktop program. You need to do it yourself or go to a local tax place or accountant.
If you have a simple return and want to file 2019 for free you can fill out the forms by hand. Here are some basic forms.....
Here is the 2019 1040 return
https://www.irs.gov/pub/irs-prior/f1040--2019.pdf
or if you want bigger type use 1040SR for Seniors,
https://www.irs.gov/pub/irs-prior/f1040s--2019.pdf
2019 Instructions https://www.irs.gov/pub/irs-prior/i1040gi--2019.pdf
2019 EIC and Tax Tables https://www.irs.gov/pub/irs-prior/i1040tt--2019.pdf
2019 Schedules 1-3
https://www.irs.gov/pub/irs-prior/f1040s1--2019.pdf
Some other tax software companies might still have software available for 2019.
It's too late to get a refund for 2019. You can file the tax return, but if it shows a refund you will not get the refund. If it shows a payment due, you have to pay the tax you owe, plus penalties and interest for late filing and late payment.