You can order a licence for Function Point Modeler in the http://www.functionpointmodeler.com. Once you have ordered the licence for Function Point Modeler a customer account will be created for you. Note that your email address will be your user id.
You will see under the legend Order Information your registration key. This key identifies your licences you have ordered.
Using your registration key you are able to activate Function Point Modeler licences as many as you ordered.
You see under the legend License Information the activated clients.

Activate a Function Point Modeler licence
Deactivate a Function Point Modeler licence