Its not there anymore..
Earlier versions of Symantec AntiVirus included product modules for Symantec
Packager that allowed you to customize Symantec AntiVirus client and server
installations. Product modules for Symantec AntiVirus are no longer provided.
Symantec AntiVirus installations are now delivered as Windows Installer
packages (.msi), which can be customized using Windows Installer features and
commands.
You can use Symantec Packager to create an installation package that contains a
Symantec AntiVirus Windows Installer package, along with other files, such as a
configurations file (Grc.dat) or content license file.