The other child comments are responding with how to obtain this in a way that is of questionable legality, which I think is not what you are asking. The officially blessed Microsoft way is essentially not available to non-enterprise customers, and it's only available to some subset of enterprise customers from my understanding. And that the cost to acquire the license is quite expensive.
This sounds like a strict upgrade to consumer-grade windows...
How does an enterprising user get a legal hold on one of those licenses?