NETGEAR Inc. exited the ProSECURE business on January 1, 2017 and will no longer provide ProSECURE software support or subscription updates for any ProSECURE devices after December 31, 2016.
All licenses will change to expired state which will prompt an email alerting that your licenses have expired. To stop this email alert it can be turned off from the ProSECURE web interface as following:
1. Login to the ProSECURE device web interface.
2. Go to Monitoring > Logs & Reports > Alerts.
3. Remove the check mark from Enable License Expiration Alerts.
4. Click Apply.

You should no longer receive an email alerting you that the license has expired.