Thanks for replying. 

I only have one Runtime folder.

In windows, by dragging the product runtime folder onto DAZ studio's runtime folder, the product's subfolders and files should be placed in the correct DAZ folders.

The product has 3 folders :

RM MelBaby was placed in the librariesPose folder (contains pz2/ rsr files)

RM Morphs was placed in the libraries folder (contains small pz2 files)

RM MelBaby was placed in librariestextures (contains jpeg files)

I've checked the paths by viewing the pz2 files in notepad, and the folders seem to be in the correct folders. Perhaps I'm not using the product correctly?

If anyone has experience of using this product in DAZ studios, I would be grateful to hear your advice