Are you able to restart your Mac after you download the state program and see if that makes a difference? See if that simple maneuver makes any difference.
Also try this. Since you have the full 2017 Mac software, start a dummy new 2017 tax return. Just a little personal info (real or fake) to get started, then go to download the state program. Then save that file. You can delete that dummy file later if this works once you are squared away.
Then close TurboTax and restart your Mac.
Then try to open your actual 2017 return file. Does it work now?
