When you unzipped the file to a temporary folder, did you look through the folder to see where things were being directed? 

I find sometimes that when I unzip a file that it will be something like this:

John Smith / Runtime

If you deposit that into your Poser runtime, the files won't go into the runtime. They will sit in the top level in a folder called "John Smith".

It's also possible that you are pasting the unzippedRuntime  folder instead of the contents of it, into the Poser runtime, which would result in something like this:

Runtime / Runtime

Here is a picture to show you the file structure of a Poser Runtime:

http://www.daz3d.com/support/faq/index.php?id=94

Basically, what it boils down to in a nutshell:

If you are looking for a Character or a piece of clothing/shoes, in Poser you will find them in libraries/character

If you are looking for hair, you will find them in either library/character/hair OR library/hair

If you are looking for character texture addons, hair textures, clothing textures, you will find them in library/poses. Sometimes on the rare occasion, a merchant will package their textures so that they go into the "Camera" folder (.cm2 files). If that is the case then you can either apply them from there, or do what I do and change the file extension to .pz2

If you are looking for props, they are located in library/props

Sometimes you will find clothing and hair or shoes in library/props too, depending on whether the item is actually created and saved as a figure, or it was created and saved as a prop.

Figure items are "conformed" or "parented"

Props are parented.

If you are just starting, it's best to get started on the right foot. DO NOT just install files into the runtime! That will only lead to frustration because you won't be able to find anything, and not all files are packaged equally and land up all over the place.

Here is a link to a tutorial on using multiple runtimes.

http://forum.daz3d.com/viewtopic.php?t=9060&start=0

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi