Wasn't the pdf file listed? If it only let you download the .tax2021 or 2020 file you need to have the Desktop program installed to open it. But you can no longer download the 2021 Desktop program or prior. They only have the last 3 years.
If you can't download the pdf file that probably means you didn't pay the Turbo Tax fees. Did you file that year? You can use www.taxprinter.com to convert a .tax file to pdf. No connection to Intuit or Turbo Tax. They might be expensive.
You can request a free transcript of your federal return from the IRS. http://www.irs.gov/Individuals/Get-Transcript
Or order an exact copy of your tax return (including all attachments) from the IRS. There is a fee per tax return. See http://www.irs.gov/taxtopics/tc156.html for complete instructions
