As Jimmy-C points out, V4 is one of the most used models, so If you’re have trouble using that,.. but you can use Genesis V5, then something ain’t right there.
Victoria 4 is a simpler model which will work in more software. (Poser Carrara, Daz studio, and several other 3D programs.
Victoria 5 uses the Genesis mesh, and will currently only work fully in Daz Studio 4
If you can explain what’s happening , or not happening,.. when you load V4, I’m sure we can help get V4 working for you.
bear in mind that if you’re using Daz Studio, then the Victoria 4 Figure and clothing can be found using the standard “Content browser”, rather than the new “smart content” (where V5 and genesis are.
There’s always been a 30 return day policy here, unlike many other on-line retailers.