Silent Install - Command Line parameters / switches for Backup Exec System Recovery (BESR) 7.x and 8.0x, 8.5 and 2010 versions

http://seer.entsupport.symantec.com/docs/297125.htm

Instalar solo el Agente, sin interface
install\setup.exe /v" /qn AddLocal=Agent,Shared,BESRSecurityShortCut,Gear"

Ahora el problema es instalar la licencia en este agente sin interface