I don't see any reason why the Purchases folder couldn't be symlinked to a location of your choice, network drive or otherwise. As long as something exists with that name that behaves like a folder, I doubt that Poser will do anything other than assume that it is and act accordingly.

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My ShareCG Stuff

Verbosity: Profusely promulgating Graham's number epics of complete and utter verbiage by the metric monkey barrel.