The smaller OS X El Capitan update is all about fixing problems on the Mac that shipped with OS X El Capitan.
When you install the new OS X 10.11.2 update you will get eight fixes that apply to most home users and three for enterprise users. Below is a list of the OS X El Capitan problems fixed in OS X 10.11.2, which are still fixed in OS X 11.3 and newer.
- Improves Wi-Fi reliability
- Improves the reliability of Handoff and AirDrop
- Fixes an issue that may cause Bluetooth devices to disconnect
- Fixes an issue that prevented Mail from deleting messages in an offline Exchange account
- Fixes an issue that prevented importing photos from an iPhone to a Mac using a USB cable
- Improves iCloud Photo Sharing for Live Photos
- Fixes an issue that may prevent Mail from completing the upgrade
- Fixes an issue that may prevent signing in to FaceTime and Messages
The OS X 10.11.3 update also includes fixes for Macs not sleeping when connected to a 4K monitor and Enterprise issues.The new OS X 10.11.4 udpate fixes many issues listed at the start fo this guide and enterprise specific fixes including.
- Fixes an issue that could cause a black screen after logging in as the root user
- Fixes an issue that prevents using screen sharing to remotely click the Allow button or Always Allow button in Keychain Access
- Fixes an issue that prevents Migration Assistant from opening when automatic login has been disabled using a configuration profile
- Fixes an issue that prevents Mail from showing the date and time of certain Microsoft Exchange calendar events
- Provides compatibility with the Cisco AnyConnect VPN client
- Improves the reliability of connecting to a Personal Hotspot via Wi-Fi
Apple also includes a number of security patches in OS X 10.11.4. In short, these small updates deliver a large number of fixes that can solve annoying issues on your Mac whether you are on OS X Yosemite or OS X El Capitan. | 
