I haven't had any issues using V4.2 alongside V4.1 and V4.0 - no I didn't read the lengthy you must do x, y and z to install this new version.  I installed the new version to a deaktop folder with the Poser executable copied in and then moved her from there to my V4 Runtime and all works tickety-boo.

First thing I did on loading her was slap all the morphs in and then resave the cr2, the one thing I liked about the original release was those morphs were preloaded.  Not done anything with her yet except render some of the male textures for a friend that was trying to make their mind up which to get.

Just more Daz hoopla for something that isn't that big a deal.  I only really buy ther ein sales now but even that amounts to a substantial amount more than I spend here.  For a time RDNA got the most of my budget but since they all but dropped G2 support I buy nothing there apart from the odd Real Deal.