April 1, 2010, McAfee turned off the V1 DAT file updates, thereby decreasing the size of the more modern and flexible V2 AVVDAT files.
VSE v8.5i is the earliest supported V2 Dat compatible version available.
Check out this: https://kc.mcafee.com/corporate/index?page=content&id=KB60404
VSE v7.0.0 has been End-of-Life for Quite Some Time (many years). It is likely that you think you are protected with this old technology, and by good luck you may not have been afflicted with malware. However, in my humble opinion, it is time to upgrade to more modern protection.