Following a number of issues with Apple’s recent OS X 10.8.2 update, which left many Macs unable to update, Apple has now released a second supplemental update for OS X 10.8.2 to fix the issue and allow affected users to finally install the update.
About OS X Mountain Lion 10.8.2 Supplemental Update 2.0
This update addresses an issue with Keychain that can affect 2012 Mac systems.
This update is recommended for all Mac systems introduced in 2012.
The update weighs in at a mere 26.65MB, and is available immediately through the Mac App Store’s Software Update, or direct download from Apple’s support page.