Mac OS X 10.9.4 Beta 3 (Build: 13E19) Mavericks Update has been seeded by Apple, and it’s a third beta version update released after the previous two releases and it’s also available to registered OS X developers and non-registered OS X non-developers (general users/public) worldwide. To update/upgrade your current old software version, you can Download OS X Mavericks 10.9.4 Beta 3 (13E19) Combo / Delta Update .DMG File via Direct Links as mentioned below.
Mac OS X 10.9.4 Beta 3 (13E19) Mavericks Changes and Features
According to OS X Mavericks 10.9.4 Beta 3 (Build: 13E19) Update changelog, it’s like a traditional update, which contains; fixes for bugs issues, fixes for performance stability, enhancements, improvements and more focus on key areas includes; Finder, Bluetooth, Graphics Drivers, Safari, Audio Drivers, App Store and no notable features and functionality has been added by Apple. It's expected that users will get more similar minor releases before the major official final released of OS X 10.9.4 Mavericks i.e. OS X 10.9.4 Beta 4 or OS X 10.9.4 Beta 5.
How to Manually Download and Install OS X Mavericks 10.9.4 Beta 3 Update?
If you have old OS X 10.9.4 Beta 2 (Build: 13E16) version installed, then you can upgrade/update via Mac App Store >> Software Update tab automatically.
Mac OS X registered developers can download the third beta update of OS X Mavericks 10.9.4 via OS X Dev Center website.