Topaz or HitPaw for instance,

are good AI tools that one can use in combination with poser these also work locally with models that get downloaded after install, here you do not need to worry. They give a good result scaling up your renders or if you want to enhance your older textures. At this point no need to go into deep technical matter and you can work offline. Might even remove the need having a poser integration! there are also some other programs but I think these have lifetime licenses ....