If when trying to register your license number on a new device you receive the message The limit of registered devices has been reached, please check the following possible causes;

Your license type has a device limit
Log in to this website and check your license type in your user profile. Each license type has a limit on the number of devices where it can be used at the same time.

You already have another device registered
If you have reached the maximum number of devices allowed by your license type, you can unlink previously registered devices to register the current one. To do this, log in to this website and go to your User profile > Devices > Unlink devices.

If you need to use your license on more devices, you can upgrade your license type by making a donation.