www.moddb.com/mods/kung-fu-30 #1 you need to download and extract the files from this link to your desktop #2 locate the main file where all Max Payne files are located and then you drag and drop the desktop files into the Max Payne file.
Sorry man you are going to have to just watch some videos or do some research to figure it out. It would be too hard for me to help you. I'm assuming you have Max Payne 2 on Steam right? If the game doesn't work anymore you might have to delete all the Max Payne 2 files and then go to steam and reinstall it to start from scratch. Before installing any Max Payne 2 mods it's a good idea to make a 2nd copy of the Max Payne 2 folder so that if things go wrong you can always resort back to that folder.