Does it work with any bones rig (ex. blender maya) or just the CC3 ?
Yes. As long as it has all of the required bones, it should work properly. If it is missing some of the required bones, however, you can use dummy objects as subtitutes
Does it work in 3ds max 2020 ?
Unfortunately, this was written in 3ds Max 2016, and extensive testing has not been done in other versions. It should, but the package includes the source code, which can be modified if need be for newer versions.
Does it keep the animation after I change to Biped ?
There is an animation recording tool, however it is finicky.
Does it export from iClone (facial)
Facial rig animations from another biped should be preserved as all this script is doing is creating a dummy biped and constraining the original rig through a combination of orientation and position constraints.