Quote - I install Vr4 into an external runtime (I don't find it necessary for it to be in my main poser folder at all, i think it can be anywhere in poser 8 and above).

Actually Poser 7 SR3 and above - and even in earlier versions of P7 if you have the search behaviour set to "Shallow". Not sure if the original PoserPro counts as an "above", but it does with SR1.