FYI: I get the same error message. The program eventually installs but I all future upgrades fail to install. I have to de-install then re-install the latest update. Hoping intuit can provide a fix.
Ref: Below is full error message.
TurboTax 2021
The installer has encountered an unexpected error
installing this package. This may indicate a problem with
this package. The error code is 2803.
