I have registered and gotten as far as the SW 2016 installation manager. I need a 24 digit serial number to request the download. Where/how do I get a serial number. I understand I will get an activation code (also 24 digit?) at some point by email. Will this be after the download? My email address is att.net, but it comes through yahoo mail. Is this also going to present problems? Something is not registering with me, and if someone can enlighten me, I would very much appreciate the help. Thank you--Ed T