Regarding DAZ figures I always had them in my Poser 6 default runtime (which was in the normal place within my Poser 6 installation). I vaguely recall that this was the only way to make the ExP stuff (i.e. morphs) work automatically in Poser, and I never had any problems.

I believe that one of the later Poser versions (not sure which) got around this, and from then on the DAZ figures could be put in any runtime.

When I had Poser 6, 8, 9, PP2014 and Poser 11 all installed side by side (i.e. before last week) they were all happily picking up the pre-Genesis DAZ figures from my Poser 6 default runtime. So were DAZ Studio 3 and DAZ Studio 4.

I no longer have Poser 6 installed (having just deleted all my pre-Poser 10 versions) and I've actually got the DAZ Figures temporarily in a F:/3D Content/Poser/Old eFrontier P6 runtime, and I think they're working fine in both PP2014 and Poser 11 (although I haven't really tested)...

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).