The author of this add-on stops development.
The last released works on Blender 3D version 2.8.
The source code and info about this add-on can be found here.
MB-Lab: the free and open source character editor for Blender MB-Lab is an advanced add-on that turns Blender in a powerful laboratory for humanoid characters creation. 100% Open Source and Free. Based off of ManuelBastioniLAB, MB-Lab is a community updated addon for Blender.
NOW BLENDER 2.80 COMPATIBLE!
Download from GITHUB the zip archive with the add-on.
Use from Edit - Preferences... Add-ons - Install... button to install from the archive file.
The add-on can be used from Layouts, press N key and select the vertical tab named MB-Lab.
You can see how this add-on works on the next screenshot: