How to contact to a research center in a university?

I need Matlab code of a method to compare it with the results of my proposed method. The method which I want to use happened to be available online by a research group in a university in US [see here]. Unfortunately, when I click the corresponding link of the method, it turns to give a server Error message. I've tried to email the guy who seems to be in charge of this page, but he didn't reply my email.

As I urgently need this code, what should I do to contact to this research group?

Also, How can I convince them to give me the codes?

Kind regards.