Here are parts I, II + others of the Mixamo Fuse characters to GG Classic YT guides I did some time ago. More and more users seem to want to know recently.
Mixamo to GameGuru using 3DS Max and Fragmotion:
Mixamo : 3dsmax script to convert limb names
Mixamo: Mixamo free animation test pack
Hardware: ULTRA FAST Quad Core Gaming PC Tower WIFI & 16GB 1TB HDD & Win 10 (x64), Geforce GTX1060(3GB). Dell Mixed Reality VR headset, Aerodrums 3D