This is the first I ever hear anything about something called "IMKClient". I don't know what that is.
I'd recommend running from source on linux if you want to do development. My environment is ubuntu 16.04.
See this for some hints on setup: http://www.makehumancommunity.org/wiki/ ... rom_source (there's an apt-get line a bit down).
If you want to follow the head of the development, you can opt for running the python3 port of MH found here: https://github.com/makehumancommunity/makehuman. To my knowledge MHAPI works with this.