I don't understand your dilemma. The post clearly says "WARNING THESE TEXTURES REQUIRE A BASE G8M or G9 SKIN TEXTURES TO WORK, THESE TEXTURES WORK ON TOP OF THE SKIN LIKE SOME GEOSHELLS. THIS IS NOT A CHARACTER PRESET OR MORPH BUT A RESOURCE OF TEXTURE"
The base G8 or G9 skin texture(s) aren't provided. They're in your content>runtime>textures folder. InverseK explained how to use them. So what's confusing you?
These textures are good, and they are especially nice because you can combine them with any textures from different characters. By the way, you can do this without Photoshop, right inside Daz in the Surfaces tab.