If you already have AWS ParallelCluster installed on your AWS Cloud9 instance, you can skip this step.
Use the pip install command to install AWS ParallelCluster. Python and Python package management tool (PIP) are already installed in the Cloud9 environment.
pip3 install aws-parallelcluster -U --user
Then upgrade the AWS CLI to get the latest version:
pip3 install awscli -U --user