Hmmm... new Darth isnt working either. It loads in Mixamo and makes a very small FBX....which won't load into Importer.@TerryRed
It will allow textures and animation you have to change from rar to zip containing obj/mtl/textures and it should work and enable textures.
then load the Obj not the FBX into Mixamo.....
I did it with the Freddy and it is really good (As is Steve's)
Try the Darth above....
It's also a real pain to get Mixamo to accept that Darth without it looking all messed up.