The "theme" actually looks like it's a theme and a module. (I'm assuming the ...
is a stand in for a huge list of files.
Your theme's folder structure mirrors a Magento folder structure. If you look at your Magento system you'll see it has a
app/code/...
app/design/frontend
While the author of the theme is the only one who can tell you how to install it, it's a good bet you'll just want to copy the files from your archive into the same folder locations in your Magento system. The OS X ditto
command does this well.