I tried downloading a mod but nothing would happen when I clicked the button
then I tried to see if it was just that one
but nothing is working
pressing download with manager & nothing happens
anyone ele having problems?

This happens when the Nexus is very busy. The recent games have brought far more new mod users than they can handle at times. You can try downloading the files to your hard drive then loading them in the manager from there, that works just as well.