I had this issue and was on the phone with a representative for over an hour. I was on the internet and the representative was able to see my screen. Nothing was wrong with my software or my computer or Turbo Tax's server. I had internet connection.
The issue turned out being my internet connection. It's a good possibility my WIFI router needed its software updated. I activated the hot spot on my phone and connected my computer to my phone. Then I opened Turbo Tax and the software automatically found the required update.
I recommend updating the firmware on your WIFI router if you have done everything else.
