Once you have your bootable USB ready, follow these steps to install macOS High Sierra 10.13.6:
Re-download the installer file using a wired ethernet connection or flash the installer onto a different, high-quality USB drive. macos high sierra 10136 dmg install
Disconnect your Mac from the internet. Open Terminal within the installer utilities menu and change your system clock to a date closer to the OS release window (e.g., 2018) using this command: date 0101100018 Use code with caution. (This sets the date to January 1, 2018). Once you have your bootable USB ready, follow
This comprehensive guide covers everything you need to know about safely sourcing the DMG file, preparing your system, and completing the installation process. System Requirements for macOS High Sierra (This sets the date to January 1, 2018)
occupies a unique space in Apple’s operating system history. Released as the final, most polished iteration of High Sierra, version 10.13.6 is often considered the "last great OS" for older Macs that cannot officially upgrade to macOS Mojave, Catalina, or beyond. It offers a perfect balance of modern features (APFS, HEVC support, Metal 2) and legacy compatibility (32-bit app support, which later versions dropped).
Despite its maturity, installing macOS High Sierra 10.13.6 can sometimes present challenges. Here are the most common issues and their solutions:
This error occurs when the installer‘s certificate has expired. Set your system date to a date when the certificate was still valid: