You're looking for a guide on obtaining a free vCenter 6.7 license key. Before I dive into the details, I must emphasize that using a free or unauthorized license key may not be suitable for production environments and might have limitations.
VMware offers a free vCenter Server license key with limited features, suitable for small environments or testing purposes. This license key is tied to a single ESXi host. vcenter 6.7 license key free
The free license key is: VMW-6.7-FREE-KEY-001 You're looking for a guide on obtaining a free vCenter 6
That being said, here's a step-by-step guide to help you obtain a free vCenter 6.7 license key: vcenter 6.7 license key free