If you go into games>all you should find a folder called Plasmid, click the plus and the folder with the model should appear (I forgot the name of said folder but it should be easy to find and be around the lines of "Human Applejack" ). If the folder is not there then its likely you installed it incorrectly
OOOH! Well I already kinda subverted it. Went n took all the humanized ponies I have and dumped them in the MLPPack. Works except for Fluttershy, who's eyes are error'd. (the realistic human one, not the anime human one)
Also, thanks for the hint at the broken eyes, I'll take a look and see whats wrong