FAQ:What happened to the MHX export in MH 1.1.x and later?
The old MHX format has been deprecated (both by MakeHuman and by the author of MHX). Although it's still a part of Blender's code base, it is not recommended to keep using it.
For the MHX maintainer's (Thomas Larsson) part, MHX has been replaced with MHX2. More info on this (as well as downloads) see https://bitbucket.org/ThomasMakeHuman/mhx2-makehuman-exchange
For MakeHuman's part, it was decided to not integrate MHX2 in the core distribution for a few reasons:
- It's a large code base with a different release cycle than MH
- MHX2 is not a generic documented standard.
- It was felt that it was better to shift focus to generic formats such as DAE and FBX.
As it stands, the MakeHuman crew recommends to primarily use DAE (Collada) as an interchange format for blender. However, if you need the specific features of MHX2, visit the link above and follow the instructions.