The vSphere Hypervisor (free edition) is perpetual and free. You get unlimited VMs (with CPU/core limits) and no vCenter management. vMotion and backup APIs are not available in the free edition.
Broadcom occasionally hides older versions behind "Partner" login walls. If you cannot see 6.7: download vmware vsphere hypervisor -esxi- 6.7
Size: Approximately 350–380 MB.
Downloading VMware vSphere hypervisor (ESXi) Custom ISO images The vSphere Hypervisor (free edition) is perpetual and free
On the Customer Connect portal, go to the "My Downloads" section. go to the "My Downloads" section.