SD2 Auto Bed Leveling

I'm hoping someone can help me.  I bought a LJ12A3-4-Z/BY inductive proximity sensor to add auto bed leveling to my SD2.  I'm following this Instructable.  I downloaded this firmware, but there is no mention of auto bed leveling in Configuration.h.  What am I missing?  Is there another Marlin firmware for my SD2 that I can use?  Thanks