ADD Kyuubi Naruto said:
It's....nexus mod manager, why am I wasting my time? Also I simply used a physical install and it seems to be working just fine o3o. What's your advice then? Cuz like...it's not really helpful if you just say "oh that's a waste of time" without any real context
I have more experience modding Skyrim, but they basically use the same system.
Nexus Mod Manager is a buggy piece of shit program that will leave mods installed when you want them uninstalled. It's trash, and there's almost no reason to use it when there are alternatives.
That being said, the alternatives are slightly more complicated, and will probably result in nothing happening, since you're having trouble even using Nexus Mod Manager. http://www.nexusmods.com/fallout3/mods/16348/?
That's the one I use.
You can also manually install mods.
For all modern Bethesda games, they use the same system. In the directory (if installed in steam, something like C:\Program Files (x86)\Steam\SteamApps\common\Fallout3), there is a folder called Data. 99% of the mods you install will end up in the data folder. The Data folder is home to .esp's and .esm's, the actual files that tell the game what to (like put X house at this place on the map, fill it with treasure, etc, etc). It is also home to folders like textures, meshes, sound, which contain all the resources those .esp's and .esm's use.
So if you want to manually install a mod, you need to download the file in a format you can deal with without a mod manager. Usually something like a .zip or .7zip. Extract the files, and move them to the data directory. Overwrite any files you have to overwrite.
Next you have to tell the game you want to use that mod. If you've done everything right up until this point and the .esp or .esm of the mod is in the data directory you should be good. Simply open the fallout launcher (don't actually go in game yet, just the launcher), and select data files from the menu. Check the box that should show up for your mod you're trying to install. Congratulations, that mod is now manually installed.
Mod managers offer a lot over manual installation, but it's important to understand what the manual install process is so you understand how the mod managers work. Mod Organizer in particular is nice, because the way it works prevents you from ever having to overwrite anything in the data files (which can become an issue if you want to uninstall a mod later).
EDIT: Oh, also it seems like you're trying to install a body mod or something, going by your T&A comment. In my experience, those are usually packaged in a way that makes manual installation take a few extra steps. They'll have several options in the file, such as Gargantuan tits no hair, or small tits, hairy as a bear, etc, etc. Look at how the folder the mod is contained in is structured. If it has several options, you'll need to choose one. In the end, the mod should look like your data files: ESPs and ESMs at the top of the folder, with everything else in a resource folder such as textures or meshes, before you move it over to the actual data files folder. You should only move as many ESMs/ESPs as the mod needs. For instance, sometimes the mod author will make a separate esp for every option the mod has. So you'd have that gargantuan tit esp, and the small tit esp. Obviously you can't have both big and small tits at the same time, so you need to pick one, and only move or activate that esp.