Changing from a trial version of 360 to another licence

It appeards that I have been using the trial version of 360 that came with my laptop. The trial has run out, how do I add this laptop to my 10 device license? Do I have to remove 360 and then redownload and install it? I have already downloaded and installed Norton Utilities Ultimate which uses my license number. I don't think Utilities Ultimate replaces 360 though.