cgsecurity.org

Hi guys Im new here and I have lost MLV files in a hard drive that I have formatted. I just need to know how to use PHOTOREC in MAC Mavericks but I download it and I don´t know how to execute it because there is not any installer or anything to press. I mean, maybe I need to use terminal? And How I use it with that? Juts drag it? I have read something about sudo but I don´t know what the heck that means.

THANKS!!