Modern vSphere 7.x or 8.x licenses typically allow you to downgrade your key to version 6.7 within the licensing portal to support older hardware.
Official licensing for version 6.7 has transitioned since the Broadcom acquisition . To get a legitimate key today: vmware 6.7 license key
For mathematics related answers only $$ Licensing\ is\ required $$ Modern vSphere 7
The VMware 6.7 license key is usually in the format of XXXXX-XXXXX-XXXXX-XXXXX-XXXXX . Make sure to enter the license key correctly to avoid any issues. vmware 6.7 license key
Keys are specific to the edition of vSphere you are running: