I am trying to reinstall Vegas 15 after an operating system upgrade (windows 10). Now it is asking for my S/N ect. Since it was an upload version, I do not have that information, nor can I find any specific details in my emails confirming the original registration. This can't possible be such a pain or why would anyone use download-style installations? It is very easy to reinstall from a CD ROM with the SN printed in the sleeve. How am I supposed to do this? Please help!