Did you use the Desktop program? Sorry you won’t be able to install or reinstall or activate 2020 or prior. They only support the last 3 years. And the License Code started in 2019. So 2019 and 2020 needs to connect to Turbo Tax to verify the License Code.
If you have the file ending in .taxyyyy you could try the TaxPrinter service to convert a .tax file to pdf at
https://www.taxprinter.com
