You could use the Deployment package kit and copy it to the machine, then execute the command to install it.
The kit is located (assuming a default installation) at $DSM_INSTALL\Packages\Public\CAUnicenterDSM\AgentAM+RC+SD\12.0\ENU\Windows_x86.
The installation is done by using the command:
DeployWrapper.exe /INST CopiedAgents /qn /l*v $PATH_TO_LOG_FILE
executed from within the kit folder. Don't forget to assign the agent after the installation with the 'caf setserveraddress <SCALABILITY_SERVER>' command.