64-bit versions of Windows 7, 8, and 8.1.
This specific version (5.1.5621) is tailored for a precise set of hardware. If you have a newer model, you likely need version or the modern Boot Camp 6.x series. Supported Models: MacBook Air: 11-inch and 13-inch (Mid 2011 to Mid 2012). boot camp support software 515621
: Early 2009, Mid 2010, Mid 2012, and Late 2013 models. 64-bit versions of Windows 7, 8, and 8
: 11-inch and 13-inch models from Mid 2011 and Mid 2012. 64-bit versions of Windows 7