- Jan 23, 2008
- Reaction score
- Keller, Texas
- Your Mac's Specs
- 2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, iPhone 11, Numerous iPods, Catalina
This update addresses the "meltdown and spectre" security issue. It should be downloaded as soon as possible. It's a lengthy update and requires a reboot. It is highly recommended that you make a cloned backup of your system first.