How to install this skin:

1. Copy "plugins" and "skins" to the root of your Cotonti site.
Replace existing files with new files.

2. Edit your datas/config.php, set:
$cfg['defaultskin'] = 'senator';
$cfg['defaulttheme'] = 'blue'; // or 'red'

3. Log into your site, go to Administration => Plugins and install
plugins from the package (if needed).