Importing new Plug-ins, VI's, and samples into Pro Tools

I have recently been downloading bundles of free plug-ins and a few virtual instruments. I continuously have problems importing them into Pro Tools to utilize them. When I dowloaded the Blue Cat bundle it had all the plug-ins ready to be dropped into an RTAS folder that put them right into Pro Tools. With other bundles I went to my library> Application support>Digidesign >Plug Ins and dropped them in but, they do not appear when I browse my Plug-Ins. Please help!!!!