OS X 10.11 "El Capitan" is the latest update of Apple's MAC OS X operating system, which includes performance improvements, updated apps, improved search, etc. and will be released to the public on September 30, 2015. As with previous releases, it will be a free and very easy update. However, Esko Software products do not support Mac OS X El Capitan yet.
It's important that you do not automatically upgrade your Mac to El Capitan but first check the list of supported products below.