NIS 2012

I have recently purchased a brand new laptop and installed NIS 2012, as I have two other laptops with NIS 2012 installed on them I have used up all available licences for this product. The brand new laptop had a major fault and was returned to the store of purchase and a replacement laptop of the same make and model was given to me.

 How do I now install NIS 2012 on this replacement laptop without having to purchase a new licence.?