How to update cloudlinux license?
Migrating licenses and servers
When you migrate from the trial activation key to a paid one, you have to re-register your installation from the command line interface (server console - run it as root):
rhnreg_ks --activationkey=<newkey> --force
For IP-based licenses you may have received from CloudLinux partners, the syntax is different:
clnreg_ks --force