This is VirusScan DAT / SuperDAT file update. The McAfee VirusScan DAT File will update your virus definition files (DAT files), while the McAfee VirusScan SuperDAT file will update the McAfee VirusScan scanning engine. Download the SuperDAT file when your scanning engine version is lower than the latest version.
This will allow VirusScan to properly detect newer and more complex viruses.
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