Click Update to download and install the 10.11.5 seed. You will not be able to revert back to your previous system after updating. Please install this update on a system or partition you are prepared to erase if necessary. As this is a pre-release build, it is not advisable to use this software on a production system with information on it that you depend on for your business. You should back-up all of your data before installing this software and regularly back up data while using this software. You need to understand the instructions for reinstalling OS X El Capitan. Please read this entire article before installing the software update seed, http://support.apple.com/kb/HT4718.
The update contains the usual bug fixes and performance improvements. We'll let you know if any new features are found. Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.
Developers can download the OS X Software Update Seed Configuration Utility from the link below...