Sow can i get above version of OPNET i.e. V17.1 and what are major differences in both the versions i.e. in 14.5 and in v17.1. how can we learn to use this modeler as i am new to this and there is no proper guidance available here in BHOPAL MP who can help me in learning the Modeler. Kindly provide me the direction of using this modeler.