I don't know, but all other experiences I've had with downloadable software were rather different and a lot faster. I just bought two of the v5e modules - there is no mention in the entire ordering sequence of the fact that you need a serial number, let alone when and how you will get it. Only after trying to run the exe-file you get stranded in the second screen, which asks for a serial number you don't have. With @Last's SketchUp, who do a lot better (and are in the US ;-)), I had my registration number in my mailbox almost before finishing downloading the program.