Apple on Wednesday seeded the second beta of OS X 10.11.4 El Capitan to public beta testers, only a few days following the release of the same beta to developers. Beta 2 is available to users enrolled in Apple’s public beta testing program via the “Update” tab in the Mac App Store.
OS X 10.11.4, while mostly featuring under-the-hood performance fixes, bug fixes, and security enhancements, does offer support for password protected notes in the Notes app, as well as Live Photos support in the Messages app.
Users wishing to join the Apple public beta testing program can sign up on Apple’s beta testing website.