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If the installer says it is "damaged," your Mac's system clock might be too new. Use Terminal in Recovery Mode to set the date back to 2018 using the command: date 0101010118 . ❓ Common Troubleshooting download macos high sierra 10.13.6 dmg mac
: If you're a developer, consider purchasing a membership from Apple Developer, which provides access to various development tools and resources. Avoid downloading macOS DMG files from third-party "mirror"