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One thing to keep in mind is that it is the McAfee Agent that performs the DAT update task.
That being said, some old versions of VSE such as 8.8 P4, you might see a situation where the DAT update task may run, but doesn't ever look to complete successfully because the McShield service doesn't get started, sometimes due to the McAfee Validation Trust Protection Service being in a "not started" or disabled state. This can happen for a few reasons, but typically it will be something like untrusted DLL injection or a failed patch update.
Your best bet on looking into why the DAT updates fail would be to investigate the logs found in %deflogdir%\updatelog.txt or Programdata\McAfee\Agent (or Common Framework)\logs\masvc.log and McScript.log.
Thank you for your response!