You have V4 installed in your Poser 5 runtime, right?

So you link your Poser 5 runtime to your Poser 10 the way hborre showed you. Just click the folder with the +, navigate to whereever your Poser 5 runtime is (most likely in ...program filescurious labs or it may be in ...program filesmeta creations

 

Just navigate to the runtime folder and you're all set. It will link the entire runtime to your new Poser. Everythung you had avilable in Poser 5, figures, poses, materials, will now be available in Poser 10.

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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.