Just adding my voice to the chorus. Like others, I purchased the downloadable deluxe version in March (directly from Turbotax website), activated without issues and did majority of my taxes. Due to the filing extensions I waited until now and tried to open it again, it auto-updated and then asked for the activation key. OId key did not work, "There was an error with validating your license code, please try again. Error code: 630." Called support, they gave a new code, didn't work. I wasn't able to locate the .tax file on my computer to ensure its saved before re-installing, so apparently I'm going to have to re-do everything assuming even I can get it to work on this computer.
Common themes I'm seeing between these posts are that people activated it without issues, later opened it up and after auto updates the program won't validate licenses anymore. This seems to be a validation server issue or some versioning mismatch with what you think the license is for.
