um well... When you unzip the folder did you delete something? if you did it will turn out white.~ Not sure which models you mean, but another reason might be that your MMD doesn't suppord the .png textures? My older models all have .png textures.~
your shinee models of piko, yuma, and yuma's vampire and chinese looks i think i have others but those are the few i remember at the top of my head. I downloaded the MMD you recommended and idk if when i extracted it if it deleted anything o.o which specific folders do i need to make then look non-white? XD then i'll check and see if i have those, if thats too hard for you then i'll just try extracting them again tanks~!