An expired certificate. Apple stopped signing High Sierra in 2021. Fix: Disconnect from the internet. Open Terminal and set the date back to 2019:
The file should download to your /Applications folder as "Install macOS High Sierra.app". Macos High Sierra 10.13.6 Raw Download
: Use the open-source tool Mist 0;b4d; to bypass compatibility checks and download the full installer or a bootable disk image (ISO/DMG) directly from Apple. An expired certificate
A5D66BC8F10E473A16C01E5B49C17ABD848C4C85 If your checksum does not match, delete the file immediately. you're in the right place.
Are you looking to download MacOS High Sierra 10.13.6? Perhaps you're trying to install the operating system on a new Mac or perform a clean installation on an existing one. Whatever your reason, you're in the right place.