If you only get a tiny file instead of the ~5.2GB full installer, try these steps:
Finding an official, unaltered "raw" copy of macOS High Sierra 10.13.6 can be challenging. Apple regularly updates its servers, changes download paths, and removes older operating systems from the prominent sections of the Mac App Store.
What are you currently using to create this installer?
Enhanced hardware-accelerated encoding/decoding for High-Efficiency Video Coding (HEVC). Macos High Sierra 10.13.6 Raw Download
softwareupdate --fetch-full-installer --full-installer-version 10.13.6 Use code with caution.
If your Apple ID previously downloaded High Sierra, it may be in your "Purchased" tab. However, the best way is using the direct App Store link: Download macOS High Sierra 10.13.6 from the Mac App Store 2. Direct DMG/PKG Download from Apple Apple provides direct installers for older versions. Download macOS High Sierra Pkg Installer from Apple Support Creating a Bootable USB Drive
Terminal will copy the installer files and make the drive bootable. This process can take 10 to 30 minutes depending on your USB drive speed. How to Install macOS High Sierra 10.13.6 If you only get a tiny file instead of the ~5
The Software Update panel will open and begin downloading the full installer to your /Applications folder. Method 2: Apple Server Direct DMG Download
Keep in mind that Apple no longer provides security patches for this version, so it's not recommended for daily internet use.
Official formats distributed by Apple, designed to run directly inside a working macOS environment. However, the best way is using the direct
:Open Terminal and run the following to download the full installer directly to your Applications folder:
Virtual machines (VirtualBox/VMware), Hackintosh, or Windows-based recovery. Verified open-source repository mirrors. GitHub macOS ISO Mirror 2. Official Methods to Get the Raw Installer on a Mac