Keep your MacBook plugged into power during the entire installation to prevent corruption.
An expired certificate. Apple stopped signing High Sierra in 2021. Fix: Disconnect from the internet. Open Terminal and set the date back to 2019: Macos High Sierra 10.13.6 Raw Download
Click or Download . This will open the Software Update or App Store window. Keep your MacBook plugged into power during the
Apple no longer prominently features older macOS versions on its main website. However, Apple still provides official download links for older OS versions through their support channels. Macos High Sierra 10.13.6 Raw Download