If you have McAfee VirusScan 8.7i ( the GUI version ), then McAfee Command Line 6.x is no longer shipped with the GUI version.
You need an NAI grant number and then you can download the command line scanner from their support portal. The file name of the latest version is vscl-w32-6.0.1-l.zip and you need to extract the files into C:\Program Files\Common Files\McAfee\Engine
If you have McAfee VirusScan 7.x/8.x ( the GUI version ), then you may find McAfee Command Line 4.x/5.x at C:\Program Files\Common Files\Network Associates\Engine\Scan.exe
If you have McAfee VirusScan 6.x ( the GUI version ), then you may find McAfee Command Line 4.x/5.x at C:\Program Files\Common Files\Network Associates\VirusScan Engine\4.0.xx\Scan.exe
Else download the scanner using the description you find below and extract the files from the zip to a directory of you choice.
In MBAdmin select View->Options->Virus and select the directory to which you extracted scan.exe.
There are several choices for downloading the scanner:
Click https://secure.mcafee.com/apps/downloads/free-evaluations/survey.aspx?mktg=ESD306&cid=ESD306&eval=90BCB5DB-1A0A-4D6E-9D5C-FB1E57C1F9DF®ion=us This will bring you directly to the registration page of NAI and once you filled out the form, you are able to download the scanner.
In the case NAI changed the link above, click at http://www.mcafee.com/apps/downloads/free-evaluations/default.aspx?pid=13960&lang=en and locate McAfee VirusScan Command Line for Window
If you have an NAI grant number, you can download the command line scanner from their support portal.
The file name of the latest version is: vscl-w32-604-e.zip
Installation instructions ar at https://kc.mcafee.com/corporate/index?page=content&id=KB51141
The latest DAT files are available from ftp://ftp.nai.com/commonupdater2/current/vscandat1000/dat/0000/
The name of the file is avvdat-xxxx.zip, where xxxx is a daily changing number.