What is the process for launching a pre-existing React Native project?

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To launch a pre-existing React Native project, follow the below steps:

1. Install the required dependencies: Node.js, React Native CLI, Android Studio, and Xcode (if using iOS).
2. Clone the project repository from the source control system.
3. Open a terminal window and navigate to the root directory of the project.
4. Run the command "npm install" to install project dependencies.
5. Run the command "react-native run-android" to launch the project in the Android simulator or a connected device. If using iOS, run "react-native run-ios".
6. The project should compile and launch in the selected simulator or device.

If any errors occur during the installation, make sure to troubleshoot them based on the error message shown on the terminal window. Also, make sure that the correct dependencies are installed and configured properly.