Most QCS users will want to use the Rigetti-hosted JupyterLab IDE to get a personal development environment with everything they need to get started. In some cases, users may choose to Install Locally. However, support for running from a local environment is limited. You'll be able to run jobs against a local QVM server, but executing programs against Rigetti QPUs won't be possible. If you are a QCS user and aren't sure which of these to choose, go with the JupyterLab IDE.