When I try to install this theme I get the message: The package could not be installed. The theme is missing the style.css stylesheet. Theme install failed.
This is due to the way ThemeForest package their zip files (the zip file downloaded does not just contain the theme it contains docs, psds ect but WordPress just requires the theme).
If you download the file from ThemeForest then extract it you will see a folder called “Upload”, Open this folder and inside you will see “Board” simply Zip/Compress the “Board” folder and re-upload it via the WordPress Theme Upload Interface.
This video and guide might also be of use to you: http://support.envato.com/index.php?/Live/Knowledgebase/Article/View/269/0/my-wordpress-theme-isnt-working-what-should-i-do