A license for WHMCS is valid for one installation only.
Licenses are bound to a domain, IP address and directory path to enforce this.
If you serve your website from the same SLD across multiple TLDs then the domain used during installation will be valid for licensing purposes. We do allow use on additional parked domains provided the SLD and branding is the same across the different domains. For example:
Please contact our Licensing team to have the additional domain added to your license. If your licence is provided by your reseller, this option will not be available.
We do not offer any licenses that are valid for more than one installation.