A button for starting 2020 taxes indicates that is the 2020 tax program, not the 2019 tax program.
You need to check again to see that you actually have the 2019 tax program installed (sometime double-clicking on the .tax2019 tax file will not start up in the 2019 software).
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Shut down whatever TTX software you have open, then Click on the Windows icon in the lower left corner of your desktop screen...then scroll down the pop-up list to see if TurboTax 2019 is down in the "T"'s. IF it is, open 2019 tax software from there. IF it isn't there, then you don't have the 2019 software installed.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
