Instead of seeking a free license key, consider the following alternatives:
On rare occasions, a legitimate license key might be posted publicly. However, WHMCS’s servers will detect multiple IPs using the same key within minutes and blacklist it. License Key Whmcs Free
If you love bleeding-edge tech, join the WHMCS Beta program. When a new major version is released (e.g., v8.0 to v9.0), WHMCS often provides to testers. Instead of seeking a free license key, consider