Hi Nick. You don’t have to download it. Bridge is a part of Looptools, and Looptools comes with latest Blender versions. Go to your addons ( File > User Preferences > Addons ), then search for LoopTools. ( It’s under the mesh category under addons ). Click the checkbox to enable it, then be sure to click the " Save User Settings" button at the bottom of the User Preferences window to save it as your default. From then on Looptools ( and Bridge) should be at the top of your specials menu W in mesh edit mode. Hope this helps.