MMC demo

Hi,
I am new and trying to learn Mesh-based Monte Carlo (MMC) for MATLAB (MMC.). I added the mmc-master folder with sub-folders to the path. When I try to run a demo file, it says 'Unrecognized function or variable 'mmc''. It happens with all the demo functions. I looked for mmc.m and could not find it any of the folders. Can you help me resolve the issue?
Thanks,
Arjun