Why can't I install any mods from Skyrim Nexus?

I can install mods perfectly from Steam, but when I try to install mods on the Skyrim Nexus, my computer does NOTHING. I have SKSE installed and NMM installed, but no mods are installing. I continually click the button to install them, nothing happens. I close out and go back on, nothing happens. Is there any way to get the Skyrim Nexus mods installed? Some of them look incredible and I would really love to be able to use them.

Notes: I think I have the latest version. I got the Skyrim game with the Elder Scrolls Anthology and ordered it on Amazon as soon as it came out on Sept. 10th, so it should be updated... I have accounts on Steam and Nexus. Also, I currently have all 3 DLC's (they came with it in the Elder Scrolls Anthology) and I have 129 Steam mods installed (not all of them set to load when I play the game. I only have about 30 that are.) and none of them are texture packs or ENBs or anything of the sort; just player home mods, follower mods, city mods, a few quest mods, etc.

The mods I tried installing that wouldn't do anything were Deus Mons, SkyUI, and Unlimited Bookshelves. I haven't tried anything else because none of these worked and I figured that if those didn't, nothing else on the Skyrim Nexus would. :/