Actually, just hit "cancel" when the installer starts searching and you can manually input wherever you want it to install to. If you then choose a temp folder for instance on your desktop, you can easily move it afterwards.

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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.