How to move a Passolo license between computers?

I am about to upgrade Passolo 2011 to Passolo 2016 using the new licensing system. I have received my activation code. An information from Passolo says "this new license can be moved between computers". Can you explain how I can move the licence between the 2 computers I am alternatively using (notebook and PC used according to my geographic location).

Thanks a lot in advance!