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Apple today seeded the second beta of an upcoming OS X 10.11.3 El Capitan update to developers and public beta testers for testing purposes



From MacRumors:
The second OS X 10.11.3 beta, build 15D13b, can be downloaded through the Apple Developer Center or via the Software Update Mechanism in the Mac App Store for those who installed the first beta.
  Apple Seeds Second OS X 10.11.3 El Capitan Beta to Developers and Public Beta Testers