Success. I was able to update and efile after installing a patch from TT Support at this link. manual update
Email below from TT support
Hello,
We have an update on the Investigation regarding the update error 42016.
We believe the issue is resolved. Please close out of TurboTax and try relaunching again.
TurboTax should bypass the update and allow you to launch the program without error, and you will be able to e-file your return.
If errors persist or you see a failed validation error when trying to e-file, please visit our manual update page.
Once the update is installed, relaunch TurboTax and navigate to e-file.
Please respond to this email and let us know you were successfully unblocked and no longer seeing the error.
Thanks,
TurboTax support
