I cant answer your question, but I can add to it! It would be nice if we could get somthing like an XML parseable page with the current engine versions, like on the fron page of contentsecurity.mcafee.com. That way I could make our Nagios check and alert when we drift more than X away from current.
This is possible using SNMP traps (instead of polling the OIDs) using the Incident IDs for updates.
For information on setting this up check out this guide:
For example, you could send a trap on the following IDs:
850 - MGAM Update Success
851 - MGAM Update Failed
852 - MGAM Download Failed
853 - MGAM Up to date
The full list of incidents can be found in the product guide on page 485:
Web Gateway 7.3.2 Product Guide - https://kc.mcafee.com/corporate/index?page=content&id=PD24502