Dont know how to activate new license

Hi,

I used to have a free license of Teamviewer, but yesterday I bougt a one-user license. I got an activation email with a link to activate the new license. I got the impression that the TV software was upgraded but when I tried to connect to another computer I just have the free license. Do I have to uninstall the current SW version and then try to activate again? Or how do I do to use the commercial version?