Hi Laurence
Many thanks for your help.
As I said originally, my Norton Management does not show NU in my Products. It is in my order history, but without any Download facility.
However, thanks to Dave H's post, I checked to see if NU15 is compatible with the operating system on my new computer (Windows 8.1) and it isn't.
Thanks very much to everyone else for their help. I apologise for inadvertently wasting your time!
Regards.
Gordon