MB Lab - BVH load & Target

I’m using Blender 2.91 with MB Lab 1.78, Retarget BVH 2.0.1 and trying to load and target a bvh file. I get the following response:


Under the “target rig” menu, which lists a dozen or so, but no mention of MB Lab. Attached is the list.
If this is the case; how do you retarget a bvh file to MB Lab? Their pose and animation button is empty.

source rigs