Replace "MyUSB" with your USB drive's name.
Downloading a "raw" image (typically a ) for macOS High Sierra 10.13.6 is possible through several methods, depending on whether you are using a Mac or a Windows PC. While Macos High Sierra 10.13.6 Raw Download
: This requires a compatible Mac (generally models from late 2009 or newer). 2. Apple Support Download Pages (Updates Only) Replace "MyUSB" with your USB drive's name
Whether you need to create a bootable USB, restore an older Mac that’s stuck on an earlier OS, or run legacy 32-bit apps – this is the last version of macOS that still supports them (10.14 Mojave dropped 32-bit support). Macos High Sierra 10.13.6 Raw Download
http://updates-http.cdn-apple.com/2019/cert/061-39476-20191023-48f365f4-92b5-4f8e-9a89-3d7b3b14ebef/InstallMacOSHighSierra.pkg
If you are looking for a pre-made raw DMG or ISO file because you cannot use the App Store method, you will likely be looking at Archive.org or reputable tech forums.