It's ok, you're not being dense.  It's just confusing.  I still don't understand why it's done this way, but, well, if I understood everything DAZ does, I'd probably be a bajillionaire :lol:

Even when you install Poser items into DAZ|Studio, you need to link the additional runtime it creates to D|S, if for no other reason than that's where the figure and/or content is installed.  If you just add that one, you'll be good (especially since that's where you installed V4).  And then you'll be able to find V4, and the world will be right again, if only for 15 minutes :)

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.