I have purchased Mathcad on my own and cannot figure out how to set it up on a coworker's laptop.

I have purchased a key for Mathcad for an employee at my company. I purchased it with my computer. I am trying to get it set up on his and cannot find a product key anywhere on my end. There are dozens of codes and numbers but none that are titled "product key." Additionally, all support videos seem to be for older iterations of the website and do not help. Similar problem with the knowledgebase articles. Any help on setting my coworker up with Mathcad 12.0.0.0 Prime would be much appreciated. I can provide proof of purchase if need be.