This theme is installed like any other PHP-Fusion themes.
1] Unzip the content of this download to your computer.
2] The folder with the theme will be located in the /themes/ folder (i.e. /themes/Area69).
3] Use FTP to transfer the theme to you sites /theme/ folder
(i.e. www.your_site.com/themes/Area69).

You can watch the theme by editing your profile on your website, or set it as the sites default theme in Administration => System: Main Settings.