so I think to fix it you need to go back to the generator and after Data go into Tools than FNIS Generator: F:\Program Files (x86)\Steam\steamapps\common\Skyrim\data\FNIS Behavior 7.4.5\Data\tools\GenerateFNIS_for_Users\GenerateFNISforUsers.exe your problem is that its not generated under "tools" after Data. Generator: F:\Program Files (x86)\Steam\steamapps\common\Skyrim\data\tools\GenerateFNIS_for_Users\GenerateFNISforUsers.exe that hopefully will allow FNIS to work correctly.