"Well it says that it's for Poser 4 but it is a prop at the end of the day and should work with any version. All the props I make in 4 work with Pro Pack and 5. I'm not sure about 6 as I don't have it. Nerd would be the best person to ask though." Sorry, I was referring to the original image in question. :-) For example, if he's using P5 or P6, there are techniques that would allow him to incorporate shadows over the background image itself, without the need for a prop geometry. P6, in particular, utilizes "shadow catcher", which is great for just this very thing. If he's using P4, then Nerd's prop (or something similar) is the best way.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.