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.
Even if you find or reinstall the Desktop program, you will never be able to activate the 2019 program with the License Code. The License Code started in 2019. So 2019 needs to connect to Turbo Tax to verify the License Code. But they have stopped supporting 2019
And if you are due a refund, the window to claim a refund has passed, so the IRS will not provide you any refund.
Here are some basic forms.....
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