Scroll down and locate the “NextGEN Facebook Update Manager” add-on.
Click the Plugin Details and Install link.
Click the Install Now button in the overlay window.
Click the Activate Plugin button when WordPress is done installing the plugin.
Enter the unique Authentication ID you received by email for the NextGEN Facebook plugin in the NGFB > Pro Licenses settings page.
An update for NextGEN Facebook should appear under the WordPress Dashboard > Updates page. Update the plugin from within WordPress (as you would any other plugin update) to install and activate the latest Pro version.