So what was the resolution here?
I'm having the same problem. I had finished both state and federal and then paid federal and this upgrade requirement popped up in order to file my federal.
I'm now stuck in this Error 1603 upgrade loop. I've rebooted, cycled defender off and on, run as an administrator. I can't use the online version.
In need of help here...this is monstrously frustrating as I can't switch to ONLINE to just file and be done and I'm not even into State either.
And why does no one follow up with a post describing the corrective action for this use case?
