Just save it to your Figures library. That way, you won't have to add the textures again.

Not sure what you mean when you say it doesn't fit. It's made for V3, and fits her pretty well. It also has a ton of morphs built-in.

If the problem is parts of V3 are poking through, you can probably fix it using the morph dials. For example, if her breast is poking through, setting BreastSize8 to 0.1 will often fix it.