The safest way is to use the App Store link, which downloads the official installer.
This typically happens when trying to reinstall High Sierra via Internet Recovery. The URL your Mac attempts to contact is often an https address, while Apple hosts the file on an http server. The most reliable fix is to bypass Internet Recovery entirely by creating the bootable USB installer as described above. download macos high sierra 10.13.6 dmg mac
A clean installation of 10.13.6 can resolve issues with slow performance, corrupted system files, or persistent errors. Safely Downloading macOS High Sierra 10.13.6 DMG The safest way is to use the App
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