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Use the official Apple link to download the InstallMacOS.dmg file [3].

To perform a clean installation, you cannot run the installer while running the system you want to delete. You need a bootable USB drive (at least 16GB). Use the official Apple link to download the InstallMacOS

Despite the release of newer, more advanced macOS versions, remains a popular, stable, and necessary operating system for many users. Whether you are reviving an older Mac, running legacy software (specifically 32-bit apps), or need a fresh start, a clean installation is often the best solution. more advanced macOS versions

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