Change the DAT_Ver number in this script to the DAT version that you downloaded (the #### portion of the zip file)
Download the latest Engine from the McAfee Download portal (Downloads -> Security Updates -> Engines -> Linux Engine Package for Use with ePO)
Extract the avengine.zip file from the Linux Engine Package and place it into /tmp
As root, run the script and let it update away (./MLS_Update.sh)
To make life a little easier on myself, I bundle the Engine, update script, and DAT file into a tarball so that I can just drop it on whatever server I need to update and then untar and execute it. The Engines don't change all that often, so you probably won't have to update it all too frequently. The DAT file is a different store, but you can easily use wget to pull down the new DAT file and modify the script with the new DAT file version number before running.
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