Just grabbed it. No .exe, so if you are on a PC, after unzipping, drag everything in the "/WDDress_pack" folder (a readme and a new /runtime folder) directly into your main Poser directory (the one ABOVE your existing "/Runtime" folder).

It will tell you it already has a Runtime folder and if files have the same name do you want to replace... blah blah blah. Say yes and these new files should all go where they need to be. btw - there are no thumbnail .rsr files, just .png's, so if you are using P4 you will just get ShruggingGuy icons. Open and resave to library to generate new thumbnails.