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
Download the .zip file
Extract the folder inside to "assets\mod_overrides" (create the mod_overrides folder if it isn't there by default)
