License revoked after register

Hello! I was trying to try the free license and I registered my controller. But I couldn't assign the dynamic ip (ports are opened, but it says server couldn't do it.. don't remember the message), so I tried to disconnect and connect again to set it again. It asked me to register the controller again, so I removed the first one and registered it again, and when I tried to load it with the Configurator, I got a "License revoked". I don't know why it asked me to register the same controller again... but I'm sure it's my fault. How can I get back my free license? Thank you!