You need to download the .tax2019 file from online to your computer. But after you get the program installed the first thing to do before you open your tax return .tax file is to update the program and install any state programs you had. So you first might need to start a fake return to be able to download the state program (go to FILE - NEW).
Then you just OPEN your file, go up to FILE - OPEN. It should find your .tax2019 file or if it doesn't you can browse to where you saved it.
