Mac Os X Lion 1072 Dmg File Fixed Link

Start by re-downloading from a trusted source and verifying checksum and file size. If the file still fails, run Disk Utility First Aid, try hdiutil verify/attach, remove the quarantine attribute, and test on another Mac or recreate the DMG. If the underlying drive is failing or the source is unreliable, replace the drive or find an authoritative copy of the installer.

A DMG (Disk Image) file is a package file format used by macOS. It is essentially a mountable virtual disk image that contains the installation files for an application or an operating system. mac os x lion 1072 dmg file fixed