Which file? There are 3 files available at that site: "spam.tar.bz2", "spam_windows.zip", and the .PDF of the paper " Steganalysis by Subtractive Pixel Adjacency Matrix" by Pevný, Bas, & Fridrich.
Thank for the response Karen M. Krahl sir. As the previously mentioned link is a very old copy of the program (2008), now I am referring the below link where they provide a function spam686.m. I computed this function for 10000 cover and and stego images (BossBase database) . Now I do not know what should i do in the next step.
@Luaay Abdulwahid Shihab yes sir, I downloaded the latest one now. I computed the SPAM function for all the cover and stego images and used WEKA tool for learning using SVM. But i didnt find the options to set the parameter values for SVM function, so I used the default values. Any help regarding this (setting parameter values) is highly appreciated.