I have the original version of Fallout: New Vegas (without the DLC) properly installed and activated on Steam. However I just bought a copy of Fallout: New Vegas Ultimate Edition on retail. When I try to install the Ultimate Edition the onscreen options are: Play Fallout: New Vegas Ultimate Edition, Reinstall, Uninstall. Should I just get rid of my current installation and then reinstall the game from the Ultimate Edition disk? If instead of reinstalling I just input the Ultimate Edition's activation code in Steam, will doing so 'upgrade' the current installation?