Once you have successfully managed to , the next step is usually creating a bootable installation drive. This is necessary if you are wiping a hard drive or installing on a machine that no longer has an operating system.
Once your bootable media is ready, the installation process is straightforward, though slightly different from modern macOS installations.
: A collection of various macOS DMG files, including Mountain Lion 10.8.
If you have a raw DMG file:
Apple often hosts older OS versions on its support site. Searching for "OS X Mountain Lion 10.8.5 Update" can provide the latest point-release files, though these are often "updates" rather than full standalone installers. Third-Party Sources and Security