I just redownloaded the V4 base file to check and in the geometries folder is a folder called blMilWom_v4b_LOD which contains lo-res versions. To make them usable (albeit without morphs)  make a copy of the v4.2 cr2 file and in a text editor replace both instances of :Runtime:Geometries:DAZPeople:blMilWom_v4b.obj with :Runtime:Geometries:DAZPeople:blMilWom_v4b_LOD:V4_LOD_1K.obj  and save the cr2 as, for example, V4.2_1K.cr2 and you will have a posable 1K V4 figure. Do the same for the other res versions and you will have lo-res versions available.

 

Same scenario with M4.