All prior year taxes must be printed, signed, and mailed in, with your W-2 and 1099 forms for that year.
https://turbotax.intuit.com/personal-taxes/past-years-products/
You can buy prior year TurboTax software as a download at above link
https://www.irs.gov/forms-pubs/prior-year
You can download free prior year forms/instructions from IRS at above link.
