You have to reinstall the program from the CD or download it again. For 2020 you only need the data file ending in .tax2020. Or the .tax2019 file to transfer into a new 2020 return. The files should be in your Documents in a Turbo Tax folder.
Did you already file? Then you need the pdf and .tax2020 file. Actually you should copy all the .tax files and pdf files for each year in case you need a copy or need to amend.
