Start here: https://github.com/rapid7/metasploitable3
Search Google for “Metasploitable 3 download,” and you’ll find: metasploitable 3 download
If you go this route:
This article is intended for educational and testing purposes only. All users are responsible for ensuring that they comply with applicable laws, regulations, and organizational policies when practicing penetration testing and vulnerability assessment using Metasploitable 3. Start here: https://github