MiachelAngelo,

I guess an illustration would help you better understand the process. I downloaded Winnie V3 so I can guide you through it more properly. The correct way to install is to drag the CONTENTS of the libraries and textures folders, not the folders themselves. In this case, the author has made their own folders that shouldn't already exist in your Runtime folder. So, you can drag them over.

Here's how you would install the morph poses (which you can't use with just the V3 Base) and the texture poses (which you can use with just the V3 Base).