The serves as a vital bridge for Intel-based Macs built between 2009 and late 2013 , allowing them to run 64-bit versions of Windows 7, 8, and 8.1 with full hardware functionality . When You Need It
Without this support software, Windows will still boot, but you’ll face missing drivers, no sound, no Wi-Fi, a non-functional brightness control, and a frustrating user experience. boot camp support software 5.1.5621