How to create multiple kubernetes cluster with curl -sS https://get.k8s.io | bash

I am running a 1.0.3 kubernetes cluster in AWS and used curl -sS https://get.k8s.io | bash to install it.

I would like to have another cluster to allow me to upgrade to a newer kubernetes version as described here.

When I try to install another cluster it gives an error.

A client error (InvalidIPAddress.InUse) occurred when calling the RunInstances operation: Address 172.20.0.9 is in use.

What's the process to create another cluster using the installation scripts?