I cannot use my new license on my websites

Hi,

I’ve been using my first license on two websites for more than one year. Today, I’ve bought a second one to use on two other websites of mine. However, as I had inserted the code of my first license on the new websites, now there’s a message saying that I have to buy a new license to insert it on my new websites. I’ve just bought the new license, and want to use it on my new websites. What should I do?

UPDATE: I’ve solved the problem by myself. Thank you!