This is pure chance, you should be left alone for 30 days (I think) after installation and after that you will/may be asked to register. This is not related to the patch, and would have happened today anyway.
Ah so. I did as John V suggested and was okay in minutes.
I guess I panicked because it's been a bunch of upgrades and patches since I was asked to register and naturely I have already thrown out all the packaging. So when asked for my installation number I feared the worst. But I found that the one I had recorded when I got v6 worked fine.
Thnaks all for the speedy response.