Yah the licensing is not expensive but confusing.
The basic licensing is the same as Epic’s marketplace in that if you buy and download an asset your licensed in hand but at the moment only covers the need for 2D image rendering. At the “moment” the <100,000 Indie license is $500 and the >100,000 is $2000 but since it is Daz 3D they have a habit of lowering, putting on sale, or out right giving away for free in support of their real business of selling art assets.
The other consideration is Daz 3D is not the only asset site that supplies working assets using the “free” Daz Studio application.
for example http://www.renderosity.com/
A lot of the free stuff is covered under CC0 which is compatible with Epic’s Unreal 4 licensing.
Texture wise there is a texture atlas tool that will combine all of the textures into a single image and since DS does support Substances you have a lot of options in that area. If you need a lower polycount there is also a decimator that will lower the count but processing in 3ds Max using Pro Optimizer does a better job.
To point it out again you don’t buy Daz Studio or the Genesis 3 frame work as both are part of the same download package which you get for free and if your only need is to make 2D sprite sheets then your licensed in hand based on what you buy or what you obtain under CC0.
Then again as someone mentioned there is Morph 3D which is
https://www.morph3d.com/about/about.php
Daz 3D repackaging Daz Studio in a more direct to Unreal 4 fashion.
LOL here’s me sounding like an ad again but Daz 3D’s marketing strategy is to sell digital art assets at a reasonable price and supplying the means to any individual to be used in any way they wish. After all Unreal 4 is no longer “just” about making video games and if Epic can fix the FBX importer and supply a proper hair shader would open UE4 to a much larger market place where polycount does not matter.