Apple released the first public beta version of desktop operating system OS X 10.11.4 El Capitan. Public beta became available after the closed test developers, which began a few days ago. To get access to the beta test via this link by signing in with your Apple ID.
Beta OS X 10.11.4 El Capitan came out a month after the release of the second major update El Capitan, OS X 10.11.2. Interestingly, the version of OS X 10.11.3 is now in the testing phase by developers and me. Thus, OS X 10.11.4 will be the fourth operating system upgrade El Capitan.
In OS X 10.11.4 El Capitan focuses on bug fixes and refinements, performance, and security. However, there are also more visible to ordinary users of the innovations. So, in OS X 10.11.4 adds support for password protected notes in Notes and live photos Live Photos in the Messages app.