Thanks so far for the reply. 85 Runtimes? That's a lot! How do you keep track on what is inside of them? Unbelievable! I think I was misunderstood in part, sorry, as you probably know, English is not my native language.

I don't want to delete the Runtime folders named Download, Purchased or Include.

I will give you an example of what I meant.

After the blank install of Poser 13 and the download of the included content, there is a LaFemme folder in the character Library,  containing a Hair folder. If you open this folder, you will find a folder named OOT. It contains a conforming Hair figure.

At the first level in the character folder you will find a folder named OOT as well, who contains the very same item.

In the material folder the different skin shader for LaFemme are inside of the LaFemme folder. One of them, the default one, I guess, is also directly in the material folder listed.

That's the default, before I start merging the doubles. I find this a bit confusing, that's all.