This version of Pro Tools adds support for Mac OS X 10.9 (Mavericks). It is for OS X 10.9 (Mavericks) ONLY and does not support earlier Mac operating systems.
If you are not running Mavericks, DO NOT INSTALL THIS UPGRADE.
Additionally, Avid has updated drivers for many interfaces including Eleven Rack, Mbox (2nd and 3rd generations), 003, and Pro Tools HD hardware. These drivers will ONLY work with Pro Tools 11.0.3. If you are not running 11.0.3, DO NOT UPGRADE.
Also, please note that the co-install of Pro Tools 11.0.3 and 10.3.x is not supported and will not work.