Corrupt download or incomplete file. Fix: Re-download the DMG. Compare file size with Apple’s official size (e.g., ~65 MB for v2.12). Use shasum -a 256 your.dmg and cross-check.
shasum -a 256 /path/to/AppleConfigurator2.dmg apple configurator 2 dmg file download
Only through an Apple Developer account (downloads section) or if you have archived the DMG yourself. Corrupt download or incomplete file