Please note that this version requires PHP 5.4.0 or above. Before upgrading, go to AdminCP -> System -> support and check the PHP version in the right-side column. If you do not have PHP 5.4.0 or greater, contact your hosting provider and ask them to upgrade your PHP version before continuing.
This is a maintenance release to fix common issues reported from 4.1.3. Many issues were fixed and performance enhancements introduced.
Update for 4.1.4.1