This theme has been discontinued. It is no longer available for download.
Options Light is a child theme of the Options WordPress theme. It’s not a different version of the theme with fewer features. It’s just a different color scheme.
It is a child theme of Options, which means that you need the Options theme to use it. But, it also means that you get all of Options’ functionality.
The theme documentation is on the Options theme page.
See the support forums for help using the theme. Also, share, rate, and discuss this theme’s future in the ideas forum.