This page is all about the meaning, abbreviation and acronym of ACU explaining the definition or meaning and giving useful information of similar terms. ACU Stands For : Aironet Client Utility, Automatic Client Upgrade, Access Control Unit, Array Configuration Utility, Automatic Calling Unit, Automatic Calling Unit.
APSL, BSD, GPL v2, and Apple EULA and NDA. Preceded by. OS X Mavericks (version 10.9) is the tenth major release of OS X (now named macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mavericks was announced on June 10, 2013, at WWDC 2013, and was released on October 22, 2013, as a free upgrade through the Mac App Store worldwide.
The good thing is internet recovery option does not erase your personal files as well as programs. It will only update the Mac OS X software to the latest version available, which is Mountain Lion as of now, but this can be Mavericks if you do upgrade after 2013 November and you had already bought Mavericks. All your programs will be intact.