Go to VMware vSphere Hypervisor (ESXi) 6.7 Download Page.All key are valid for vSphere 6.0, 6.5 and 6.7. If you already obtained a free key for ESXi 6.0 or 6.5 and you want to upgrade to 6.7, you can proceed to use the old key. Other limitations like the 32GB Memory or 2 CPU Socket limit are no longer in place.
Free ESXi cannot be added to a vCenter Server.No commercial support (But great community support).The binaries you will receive as 'Free Hypervisor' are 100% identical to the paid version but with some software limitations. The license key can be created for free at VMware's website.
VSphere 6.7 has been released and as known from previous versions, VMware provides a free version of their Hypervisor ESXi for everyone again.