Yeah in theory you could move textures and geometries. But it would be a royal PITA to hand-edit all files to point at their new "home" If you're planning to use Poser, you might as well get a bigger HD sooner than later. You'll need it :) I have a 40Gb disk for my Poser alone to reside on. 3/4 of it is filled by now :o) - and that's NOT counting my Poser 5. But I do install everything into my old crowded PPP-runtime and link to if from my Poser 5. That way it's accessible from both Poser 5 and Pro Pack, should I ever need that.

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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.