I'm only just starting to get to grips with Joomla! And I seem to have failed at my first attempt....
I've successfully installed Joomla on a server (but not locally).
I've downloaded the 'Elemental' RocketTheme template.
But when I then try and upload the zip file using installer/templates/site and browsing to the locally stored file on my Mac, I get the error message 'Upload template - Failed. XML setup file is not for a 'template'.