After downloading the mod, use a program such as 7zip or WinRAR to extract the main folder of the mod.
Drop that folder into the mods folder which is supposed to be in the game's installation folder (don't know where that is? click here)
there are 2 files in the zip named: bloxy cola mods and bloxy cola mod_overrides
you have to put the "bloxy cola mods" in your mods folder and the "bloxy cola mod_overrides" in mod_overrides folder