The server edition of the plug-in can be registered with a 10-user or higher license key. As long as you purchase at least a 10-user license of the plug-in, you can use your same license key to register the plug-in on any client machines you have (up to the number of users you purchased) and on your server.

You can purchase a license that will register the Server plug-in (along with any of our other plug-ins) from our secure site.