I tried to re-download the latest version of OSX Mountain Lion installer from the App Store, but it says it cannot, because Mountain Lion is not compatible with my computer.
I have a new iMac 27" that is running Mountain Lion on a Fusion Drive. Why won't the App Store let me download the installer?
iMac (27-inch, Late 2012), OS X Mountain Lion (10.8.2)
The Late 2012 iMac has got a special OS X version that it's not available in the App Store, and that's why you get a message telling you that your Mac isn't compatible, but you're using Mountain Lion.
Until Apple releases OS X 10.8.3, you can only reinstall OS X Mountain Lion starting into Recovery, pressing Command and R keys while your Mac is starting, so you can't create a USB drive. When Apple releases OS X 10.8.3, download Mountain Lion in the App Store and you will be able to create a USB drive with OS X Mountain Lion with Lion Diskmaker
The Late 2012 iMac has got a special OS X version that it's not available in the App Store, and that's why you get a message telling you that your Mac isn't compatible, but you're using Mountain Lion.
Until Apple releases OS X 10.8.3, you can only reinstall OS X Mountain Lion starting into Recovery, pressing Command and R keys while your Mac is starting, so you can't create a USB drive. When Apple releases OS X 10.8.3, download Mountain Lion in the App Store and you will be able to create a USB drive with OS X Mountain Lion with Lion Diskmaker
Thanks. That answers that question.
You are welcome
Download lastest version on Install OSX Mountain Lion
