SadieFae is a set of clothing for Toon Girl Sadie, and there are two files to install according to the Product Page. One contains the models themselves, and Poser textures, the other contains only materials that have been optimised for DAZ Studio.
The Poser ones, you should find under Poser Formats in the Content Library, in My Library > Figures.
You say you bought Sadie and Sam? Was that this one http://www.daz3d.com/shop/sadie-and-sam-for-genesis .
If so, these are morphs for Genesis, and not the standalone Sadie figure that is required for SadieFae. The Sadie figure that is required for this is this one http://www.daz3d.com/shop/3d-universe-toon-girl-sadie and i,t does not work with Genesis at all.
You can send a ticket to Support, and ask for a refund, which you will get with no problem.
I can see how this would be very confusing to most new users. I bought Sadie years ago when it first came out, but I also bought the Genesis morph versions as as well as they are much more versatile, and can use clothing from other toon models or even V4 using the Autofit plugin.