Validation for setting 'ACTION' failed. Error message: The specified value 'Upgrade' is invalid. To run in unattended mode, you must specify a valid ACTION. The valid values for ACTION are: '
And then it goes on to list a number of options - including Upgrade
. Certainly a bit confusing.
But if you are running a third-party installer that runs the upgrade, you need to talk to the vendor. We don't know what that installer is doing.
Then again, why not run the normal install package for SQL 2016?
(And why SQL 2016, a version that is out of mainstream support?)