the best way to install AWS CLI on Mac is by using the bundled installer as it includes all the dependencies and you can even use it offline.
1. Execute the following command:
curl "https://s3.amazonaws.com/aws-cli/awscli-bundle.zip" -o "awscli-bundle.zip"
sudo ./awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws
2. Run the installer
And you are done !! :)
Check out my answer here as well: https://www.edureka.co/community/62506/how-to-install-aws-cli-on-mac