If the EPO server can access the internet, then there is no requirement for the PC's to have internet access. All DAT files/updates etc are downloaded to the EPO server daily and then these are deployed to the PC's.
the ePO server and all associated pc's are not connected to the internet. I can download the files from a different system and move them over but I don't know what all needs to be downloaded and moved and where they need to be moved to.
You can just download the DAT files from McAfee, Inc. - Downloads - Virus Protection - DAT Files and import them into EPO from the Master Respository screen. New DAT's are released daily.
You will need to download the Agent and AntiVirus using your grant number.
as sbsnwnm1 said you have to install epo,and then download the vse,then install it in epo and deploy it to all pc,then you can download the dat from McAfee, Inc. - Downloads - Virus Protection - DAT Files ,engine McAfee, Inc. - Downloads - Virus Protection - DAT Files and check in it into your epo and give a update task for all systems