The ClientExec license manager only works with the domain provided on your initial signup. If you wish to use ClientExec with another additional domain you will need to purchase an additional license.
You may change the domain that your ClientExec is licensed for by submitting a support ticket. If you do not have access to the support center because your support has expired you will need to extend your support service. This is the only method to change the domain where you can run ClientExec from, outside of ordering a new license.
Note: If you were provided your license by a reseller, you will need to contact your reseller to change the domain your version is licensed for. It is up to your provider to determine if they wish to change your domain for fee.