Hi Rob,
Apache 2.4 is required.
The Apache version is installed via the Hitachi Installer from what I can see, not via the normal system manager; below some resources you might find helpful if you're trying to install Ops Center:
You can find everything you need to get started here:
https://knowledge.hitachivantara.com/Documents/Management_Software/Ops_Center/10.8.x/Get_Started_with_Ops_Center
Manual install instructions available here:
https://knowledge.hitachivantara.com/Documents/Management_Software/Ops_Center/10.8.x/Get_Started_with_Ops_Center/06_Install_Hitachi_Ops_Center_products_by_using_the_installer
It's much easier with the OVA details available here:
https://knowledge.hitachivantara.com/Documents/Management_Software/Ops_Center/10.8.x/Get_Started_with_Ops_Center/05_Install_Hitachi_Ops_Center_products_by_using_the_OVA_file