Inside Daz Studio you will find a folder called "Content"  this is the folder that you install to.
If you get the free stuff at Daz you will get installers and you won't have to worry about where to put anything..its all automatic.
Look inside the unzipped folder that you got from renderosity and see the "content" folder there?   You want to put the stuff inside that..inside the content folder in Daz.
Now..it seems like everyone does it differently.  I copy and paste the whole content folder and let it overwrite the daz content folder.  ..same as with runtime folders in poser.
If yu have winzip it will install for you if you tell it to.  I don't use winzip..sorry.
Lots of ppl have their own way of setting up their runtimes etc.  
Someone may be willing to tell you an easier way.

 

“For those who believe, no proof is necessary. For those who don't believe, no proof is possible.”

[Stuart Chase]