ok, i installed nmm and it didnt find fallout 4. I manually selected it from its main folder which for me is C:\SteamLibrary\steamapps\common\Fallout 4. i restarted nmm and it said i was missing a file fallout 4.esm. It said the file should be in the C:\SteamLibrary\steamapps\downloading\377160\Data. I copied the file over to that folder and now it starts but the game doesnt use the mods. i can download and activate mods, but they dont work in game
Did you try manually putting the mod files into the fallout 4 data folder.