If your license expires then the plugin will still continue to work but you won’t have access to plugin updates or customer support. However, if Facebook or WordPress changes something in the future which affects the functionality of the plugin – such as a Facebook API change – and we release an update to the plugin to account for the change(s) then you wouldn’t have access to the latest version in order to keep the plugin working correctly. If you renew your license key within 60 days of it expiring then you can do so at a 50% discount. After this time period you would need to purchase a new license at full price. There’s more information about this in this FAQ.