If you installed version
6.0.7 that is Precision XOC, which is the newest branch of the software. It was remade with some new features for Nvidia's Pascal 10XX series cards. It is actually a completely different utility then PrecisionX (The latest version of which is
5.3.11 and can be found ). The skins for Precision-X are not compatible with Precision-XOC. Read through some of this thread to get a basic idea of the situation for skins. Now a small piece of good news is just a few posts above yours; that being the Gentleman/woman who authored the Fallout 4 skin everyone seems to like will update it for XOC when he has the time to spare.