Modern macOS versions (since Catalina) have switched the default login shell to but still include Bash 3.2 at /bin/bash for compatibility with existing scripts.
Downloading Bash 3.2 is typically necessary only for developers maintaining legacy scripts or for macOS users investigating why their system uses an outdated shell. Released in 2006, version 3.2 is the final version licensed under ; subsequent versions moved to GPLv3, a license that Apple chooses not to support. Where to Download Bash 3.2 bash 3.2 download
If you need to download Bash 3.2 for manual compilation or historical study, it is hosted on official GNU repositories: Modern macOS versions (since Catalina) have switched the
For faster downloads, use a local GNU Mirror to find bash-3.2.tar.gz . Bash 3.2 on macOS: Staying or Upgrading? subsequent versions moved to GPLv3