As pull requests haven't been merged for some time, and we haven't really heard anything more about MHX2, we have started a semi-official fork of it. The fork can be found here: https://bitbucket.org/Aranuvir/mhx2-mak ... c/default/
We will continue to try to push fixes upstreams to Thomas's original repo at https://bitbucket.org/Diffeomorphic/mhx ... c/default/
The main point of the fork atm is to make MHX2 play nice with blender 2.80, something which is becoming rather urgent now that 2.80 is released as stable.
The plugins page (http://www.makehumancommunity.org/content/plugins.html) has been updated to provide a link to the fork.