You’ll need a USB drive with at least 1.5GB of free space and an internet connection.
- Boot your Mac into recovery mode (hold down Command-R while it boots up).
- In recovery mode, select the option to open Safari.
- Go to http://support.apple.com/kb/DL1524 and download the 10.7.4 combo update. Right-click and save it to the external drive. The recovery partition you booted from doesn’t have enough space, and your main partition probably shouldn’t store the update while it updates.
- Once it’s done downloading, exit Safari. Go up to Utilities and open up the Terminal.
- Mount the DMG you downloaded. Make note of the name of the mountpoint OS X creates for you.
hdiutil attach /path/to/the/dmg ls /Volumes
You’ll want to grab the name of the .pkg file held within the DMG you just mounted.
- Apply the pkg to your main partition. In the ‘target’ parameter this will be whatever the main disk is you usually boot from. Mine was “/Volumes/Macintosh HD”
installer -pkg /path/to/the/pkg_file -target "/your/main/partition"
- Wait a half hour. The terminal won’t report anything until it’s done.
- When it’s done, reboot your Mac (Apple menu, reboot). It might take a while to start up. I think it does a
fsckor permissions repair.
- Your Mac should be booted up just fine now. If it’s a little sluggish, observe the magnifying glass icon for Spotlight. It might be re-indexing your hard drive.
Thanks to this post for info: