Updater fails with Unexpected Error SerializationException. Both for the main program and when trying to install the State program.

[CarissaM]

It would be best to contact us by phone by following the instructions here so we can look into this further @HelpMare. 

[cjk005]

Thank you for the post. I was unable to update TurboTax 2021 due to the same error. I was able to solve the problem as you noted. I used KenLam's fix from above and that worked without downloading the SQL.

[DaraLO]

@cjk005 So glad you were able to get the software downloaded. Thanks for updating us!