Turtle, Universal Texture Convertor is a brand new product, from what I understand, which will eventually (with plug-ins) allow conversion between most Poser figures textures.
Daz appear to be offering customers who bought Dark Whisper's V2-V3 Texture Convertor from them a reduced cost upgrade to the Universal Texture Convertor.
Perhaps my question was too quick off the mark and Dark Whisper has not yet been able to arrange for others to purchase the upgrade.
It would of course be simplest and good business if Daz allowed non-Daz purchasers of the V2-V3 Texture Convertor to upgrade from them.
Perhaps they will.
Dark Whispers V2-V3 Texture Convertor is a fantastic utility for all Poser users and I have the highest of respect for it and its creator.

Regards
STORM