When I download add-ons from [this page](https://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts), sometimes I get a zip file, but sometimes it's just a link like [this](https://svn.blender.org/svnroot/bf-extensions/contrib/py/scripts/addons/add_mesh_rocks/). 

I don't have programmer training, but I know that's something to do with calling an action from the console. Before I just copied the text into a text file, saved it as a zip and installed it that way, but what's the actual way to get the add-on from a link like that?

I saw this: [How can I get a list of the installed addons using the API?](https://blender.stackexchange.com/questions/2797/how-can-i-get-a-list-of-the-installed-addons-using-the-api) but it doesnt help me.