no probs here,just made a folder at the root of my HD named runtime,then created a a text document and renamed it poser.exe. then run the V4.2 installer and set the destination to my fake new folder(called runtime), the i have all the V4.2 files all where i need,i then dragged and dropped them into my external poser runtime and all works fine, including V4 and V4.1
painless....

Getting old and still making "art" without soiling myself, now that's success.