activating trial licenese for SWX 2009 Premium

Ok so I have a trial license (30 days) to ativate for SWX2009 Premium . My question is do I have to uninstall and re-install the 2009 I already have or can I update it in such a way that I do not have to?

My first inclination is to put in the cd and activate from there.

any and all comments appreciated.

Mark

SolidworksGeneral