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Be using release R2014a or later and have it included in your license. The
latter part of that may involve your license administrator, if you need to
purchase it to add it to your license.
> can i buy it or can i get the trial for student?
This page indicates that this toolbox is not available for use with MATLAB
Student or Student Suite.
http://www.mathworks.com/academia/student_version/companion.html
If you are a student using your university's license, it may be available
but you should check with your license administrator (probably your school's
IT staff) for more information about that specific license.