You guys don't understand a word of the issue here.
The issue IS NOT : I cant put a mod that is under "Mods" in the "Plugins" section.
The issue IS NOT : One of the mods under "Plugins" doesn't appear in the "Mods" section.
The issue IS NOT : I don't know how to activate a mod.
We all know that. We know how to activate a mod, we know the good procedure and we've done it for 80 other mods before.
The issue IS : After downloading a mod, it is supposed to appear in the "Mods" section, but it doesn't. The mod simply finnishes downloading, and nothing else appens. It is not in the Plugins section, because I didn't activate it, because it is not showing up in the "Mods" section.
In my case, it's Dovahkiin relaxes too. I had the same issue with interesting npc. Now that this is clear, does anyone have a fix for this ?
EDIT : In the "Mods section, there is a button to switch the mod manager view. Doing this removes the categories and our hidden mods finally show up ! You're welcome.