I've tried using NMM to install it, and manually installing it, and it worked out both tries. LooksMenu for Fallout 4 is a different story. I use RaceMenu for Skyrim all the time, with no issues at all. Most recent version of F4, LooksMenu, and F4SE. (Feel free to ignore the rest of this post) I feel like I've tried everything, but nothing seems to work. I have editied the F4 ini so modding can be possible. I have the latest versions of Fallout 4, F4SE, Skyrim, and SKSE and they're all admins.
NMM is running as an Admin, and it's fully up-to-date. When I check the status all it says is 'An error has occurred' and nothing else. The little install symbol appears at the bottom for like a econd, then it says Idle without installing the mod. However sometimes when I spam the activate button the mod miraculously decides to install. Then, just out of the blue, some mods just won't activate. I've had Nexus Mod Manager for YEARS and have had few problems.