The following is a summary of the Pro version installation process. The complete and detailed installation instructions, for both the Free and Pro version of NextGEN Facebook, are available here.
Updating to the NextGEN Facebook (NGFB) Pro version is simple and easy — click on the “Purchase the Pro Version” button on any NGFB settings page. After your purchase, an email will be sent to you with an Authentication ID and installation instructions.
The NextGEN Facebook (NGFB) plugin and its extensions use the NextGEN Facebook Update Manager (NGFB UM) free extension plugin to check for Pro version updates. If you haven’t already installed the NGFB UM extension, please see the NGFB UM download and installation instructions here.
Once the NGFB UM extension has been installed and activated, enter the unique Authentication ID on the NGFB > Pro Licenses settings page. After saving the changes, an update for NextGEN Facebook (NGFB) will appear on the WordPress Dashboard > Updates page. To install and activate the new Pro version, update the plugin from within WordPress (as you would any other plugin).
If you use a WordPress multisite configuration, enter the Authentication ID either on the Network NGFB > Pro Licenses settings page (to license several sites at once), and/or in the individual site / blog NGFB settings. Note that the default site / blog must be licensed to allow Pro version updates from the Network admin interface.