As long as you don't rely on displacement maps, and still keep your stuff UVMapped, you can use Poser 5 stuff just fine in Poser 4/Artist. Of course you shouldn't use nested folders, though people CAN move it manually. My latest freebies are all made in Poser 5 and uses P5 shader nodes, but they can be used, and textured in Poser 4 as well. A current example is my new lasagna, that loads white but gets colours from the shaders when it's rendered. And of course P4 users could just use the flood fill to colour it - or find a pic of a real lasagna and use it as a texture map :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.