Rekordbox and my CDJ-2000s

Hi Guys, 

I need some urgent help.

I have a pair of CDJ-2000s as well as a DJM-2000 which I would like to use with the new Rekordbox software which I cannot get working.

I used a very old version of Rekordbox about 6 years ago when I last deejayed and the software looked very different from the latest version of Rekordbox.

How do I go about activating the new Rekordbox software to get my decks working with Rekordbox, where do I get an activation/serial key from?