"Proactive HA" is a new feature (actually an advancement of HA), which is available with an "Enterprise Plus" license.
"HA" itself - i.e. restarting VMs in case of a host failure - is still part of the Essentials Plus edition.
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You are looking for vSphere HA, not Proactive HA. vSphere HA will restart VMs from failed hosts to healthy hosts. Proactive HA communicates with hardware vendor monitoring solution to detect failed or unhealthy components. Things like fans and power supplies. When those failures are detected, vSphere DRS will begin to move off VMs from the affected hosts before a component failure causes an outage.