See the following TurboTax Help article.
Error 42016: Unexpected content received when updating. Older versions of TurboTax may display An exception of unknown type has occurred in conjunction with this error. Please click this TurboTax Help link to learn more.
Solution
Important: Back up your tax data file before proceeding (preferably to a removable device, such as a thumb drive). There is a chance that the solution may corrupt or lose your tax data file.
If error 42016 persists: