If you have old humanoids in Makehuman 1.0.2, here is the solution. JSON file for Rigging in Makehuman 1.0.2 for Unity 2017 and Lower. Put the unity.json and unity thumb in: C:\(Where you have installed)\data\rigs. Example: C:\Program Files (x86)\Makehuman-1.0.2\data\rigs Don't worry about T-Pose, it will adapt perfect for animations.
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