Reply to S2 second hand sale

Hi yal, im new here but fairly familiar with Traktor and starting to learn some DJing.

I recently picked up a slightly used S2 local a few days ago. The owner has unregistered the serials for the software so that i can go about installing it on my end and registering since it has the 2.5 software.

So how do i go about installing? he sent me 2 serial codes that NI sent him ( he did show and prove emails between then when i purchased ) One code says its for regular Traktor Pro. then next is Traktor Pro 2 upgrade. so do i need to DL the first traktor then update to 2? and then how do i go about upgrading to the 2.5. he said i may have to call NI to get some serial code or have them enter it in? The disc the seller gave me is TSP2. which i believe he accidently gave me is scratch cd instead of regular TP2.

Anywhere to DL on NI's site. since i have working serials?

any help is greatly appreciated! Thanks

Ryan