Make sure you save the .tax2019 file to your computer before trying to open it. The default location for turbotax client files is: C:\Users\[your name]\Documents\TurboTax
Save the return and then try to open it from within the TurboTax program [File > Open]
If you are using a Mac, try uninstalling the TurboTax program and then reinstalling the program. Here's an article that will help: Remove and reinstall TurboTax for Mac
