Jacob Mann has offered a comprehensive tutorial on using Mixamo with Smile Game Builder’s popular B-Style characters. And the best thing about this method is also compatible with Unity when exported with the Exporter for Unity DLC.
Support Tool for Making FBX Motions Files with Blender
There is a useful and necessary tool, called TimeSpanEndFixTool (provided by SmileBoom). It’s at the very bottom of the page.
What this tool does is fixes the end frame limit of 60fps so longer animations don’t play to the end.