This may happen for new systems that ship with OS X Mountain Lion, which may seem odd since they are already running the OS and therefore ought to reinstall just fine. The OS X installer includes a list of compatible systems on which it can be installed, so if the installer you are accessing is older than the system you are currently using, it will not have the machine code for your system and will therefore issue an error when you try to download and install the OS from the App Store program itself (including manually created Mountain Lion installation DVDs). While this issue seems to be a problem for users, for some this behavior may simply be a matter of compatibility with the Mountain Lion installer that is available on the App Store. Apparently affected systems may also have difficulty restoring from Time Machine backups as well, where they may see an error stating that the system could not add a recovery system to the destination disk. Instead of installing as it should, users see a warning that states the current system is not compatible with Mountain Lion, with the only option to click "OK" and cancel the installation. An apparent issue in the versions of OS X that are preinstalled on Macs shipping from the factory is causing headaches for some users, where they may run into problems if they try to reinstall OS X or restore from a backup.Īs described by MacNN and MacTrast, the issue appears to happen because of a permissions problem that results in a compatibility error when the Mountain Lion installer is downloaded and run on an affected computer.
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