Try it again now! I got the same error message (unable to connect to the internet Error 42016) multiple times over the last few days. I just simply tried running TurboTax again and it gave me the option to update, I updated successfully, and I was able to file the state (WI) and federal taxes a few minutes ago (18:28 CT, Sun 15 Oct 23) without any issues.
Best of luck!
