I think I'm kind of repeating the OP and perhaps hijacking..but here we go:

1 - Remove passenger side footwell upper cover panel (under glove box down low - black - cant seem to locate part #). Three Philips head screws I believe.
2 - Disconnect footwell lamp and position the cover panel which is still connected by another wire of some sort over vertically against the center console.
3 - Remove "Air duct, footwell, passenger side". Two torx screws. Part # 64119129300.
4 - Remove small duct to the right (cant seem to locate this part # either). No removal of screws required. You will see without popping this small duct out you cant accomplish Step 5.
5 - Remove "Cover Microfilter". Part # 64119128857. No removal of screws required. You slide it slightly toward the drivers side and pull out.
6 - Once you remove the cover in Step 5 the filter just slides directly down toward the carpet/footwell area from its slot. You have to bend it slightly to get it out as the corner hits the diagonal carpeted front wall of the footwell.
7 - Install new filter by sliding it up back into the slot.
8 - Reinstall all items in reverse order.

Sorry...no pictures...but it really is strictly logical once your down in that footwell area.

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Current BMW's:
2013 E70 X5 xDrive35i Premium (mine)
2014 F25 X3 xDrive28i (hers)
Past BMW's:
2001 E46 325i
2001 E46 330ci
2003 E39 525i
2006 E53 X5 3.0i
2008 E70 X5 3.0i
2014 E84 X1