There should be an instruction document with the free download (I think).
Basically, when you buy Groove Monkee MIDI patterns, you'll get them mapped for different drum instruments. Off the top of my head, you get ones for General MIDI (works in Battery etc), Session Drummer, Studio Drummer, Superior Drums, Steven Slates Drums etc. They're arranged into folders. They're different because each drum instrument has its own drum map (the notes that each drum are assigned to). It just means that if you're using Superior Drums, you use the patterns in the Superior Drums folder etc. Pretty self explanatory really.
What I really like about the Groove Monkee patterns is that they're not quantized. They're played well enough that they're good enough to use "as is," but if you want a tighter, more mechanical feel you can quantize them to taste. You can also make them sound very different, for example by quantizing them to triplets.