Moving From One License to the Family Pack [3 Licenses]

I currently own a single license of Nero Platinum [or equivalent] '12. I am considering purchasing a second license for my partner and have noticed that Nero has a 3 license Family Pack.

Am I able to take advantage of the Family Pack by paying the difference between the value of my current license and the Family Pack? If so, how would I go about doing this?

Thanks in advance
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