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Where is the manual on how to get this to work in Poser?

Poser does not eat nor drink : daf, def, dif, dof, duf, files.

If DS or DSON are required during the process?

The "Del" button is armed and ready.

It's a character morph and texture set for the Genesis 2 Female base figure, so if you don't use DS4 or the DSON importer for Poser, then you are wasting your time.