Supervisor does not allow use of commercial software for student project, against student's interests
The student license can be cheap, but the standard license is probably not. If the chair doesn't have funding for a standard license, or they are not interested in this specific software, the lab will end up with an unusable piece of software as soon as you leave. This is certainly not in the interest of the lab.


  What would you advise me to do?


There's not much you can do: either accept the chair's choice of software or go find a project in a lab which uses your preferred choice of software.