When I started with VoiceFX, my original goal was to only support VST 3.x, as it was the most modern version of the SDK, and surely by now every important software had moved to it. Unfortunately I didn't account for the occasional big shot releasing a modern product with a relatively ancient version of the SDK - an SDK that no longer officially exists. So what do you do in this situation? You do what every other totally sane developer does and start a clean-room reverse engineering project for the now abandoned VST 2.x SDK, staying faithful to the law....