So here's an example of how I install it, this is ali hair Hr-149 which is the name of the folder you see here. I usually put everything in the same folder, including the obj, but I edit the cr2 to load without textures and point to where the obj is now. The folder called 'MAT' contains the mat files from the original hair AND the textures for it, the other folders are MAT files for addons, with the textures in the same folder. This way I have everything in one, neat folder. But it's not practical for everyone ;)