how to install Baxter on top of Ridgeback

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I have a Baxter on top of the Ridgeback and trying to run everything in 1 machine. I follow the instruction and ssh to Ridgeback then from the Ridgeback I ssh to the Baxter. I tried to enable the Baxter with command "rosrun baxter_tools enable_robot.py -e", but it couldn't find the package. I think it is because in the Baxter, there is no SDK Rethink software, the problem is I can't download or install it while ssh into it, because it doesn't internet inside the robot. So I would like to ask how to install the SDK software while you are inside the robot. Will scp command to copy from the local machine to remote work?

I use ROS Indigo, Linux Ubuntu 14.04 LTS