As for 2019---you are too late to file a 2019 return and receive a refund. If you were getting a refund for 2019, it has been forfeited and will not be paid. But if you owe tax due for 2019 you still have to pay the IRS with late penalties and interest. Software is no longer available for 2019. We can give you a link to the forms to prepare by hand.
2019
2019 Instructions
https://www.irs.gov/pub/irs-prior/i1040gi--2019.pdf
1040 https://www.irs.gov/pub/irs-prior/f1040--2019.pdf
1040SR https://www.irs.gov/pub/irs-prior/f1040s--2019.pdf
2019 Schedules 1-3
https://www.irs.gov/pub/irs-prior/f1040s1--2019.pdf
https://www.irs.gov/pub/irs-prior/f1040s2--2019.pdf
https://www.irs.gov/pub/irs-prior/f1040s3--2019.pdf
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