After downloading the mod, use a program such as 7zip or WinRAR to extract the main folder of the mod.
Move the main folder of the mod to assets/mod_overrides. The assets folder is supposed to be in your game's installation folder (don't know where that is? click here for PAYDAY2 folder). Create the folder if necessary
Install? Put the folder with the mod in your assets/mod_overrides folder.
P.S.
if you listen to the full version on soundcloud, you will hear a solo at the end. There is a solo in the mod, but inactive. For activating that:
go to the mod folder -> sounds. There are assault and assault (alternative). Rename assault file as you wish, then rename alternative file as assault. Done :3
