3D FlipBook - Purchased License Key and Can't Figure Out How to Add License Key or Install Pro Plugin

Hi, I just purchased the License key and can't figure out how to either add the License Key to the plugin or how to install the plugin. Every time I try to install the 3D_FlipBook_WordPress_Plugin_Pro_Edition the plugin Wordpress says "The package could not be installed. No valid plugins were found."

Can't find any documentation on how to upgrade to pro. Thanks.

Emmett