If you don't have all the extensions checked into ePO, this can cause some functionality to be missing.
It appears for Hips 8 if the "Host IPS License Extension" isn't checked in (HostIPSLicense.zip), this can cause the IPS to be missing from the Policy Catalog.
Hope this helps.
The Host IPS 8.0 product is sold as Firewall only or Firewall/IPS. Please see page 27 of the Host IPS 8.0 Installation Guide for the extensions list.
PD22891 - Host Intrusion Prevention 8.0 Installation Guide