I used the Online version. I have saved the PDF already. In past years, I have also saved a .tax file so that if I want to use other software or online service in the future, I can upload the .tax file to whatever software or online service I want to use. I have a Dell Inspiron running Windows 10. Typically downloads show up along the bottom just above the task bar. I can click the ^ and select "save" from there. This particular .tax file does not have that option...I can select open or always open. Since I have no apps/software that can open a .tax file, I can not open it from there - if I did, I would simply open it and then save it as a .tax file.
