GSP is protected with a registration key. An unregistered version will have limited capabilities, i.e. saving of many non-standard components (see the feature matrix). Registration of GSP gives you the benefit of NLR support in the form of answering questions, assisting in solving problems and development of new models according to the license agreement.
The registration code is coupled to a specific registrant name. The registration information if supplied through e-mail upon payment delivery. Copy both the registrant name and the registration key into the input boxes of the registration window.