Double-click the InstallOS.dmg you downloaded. Inside, you will find a .pkg file. Run that .pkg file. It will install an app named Install macOS High Sierra into your Applications folder.
If you're not eligible for downloading macOS High Sierra 10.13.6 or need a newer version, consider: download macos high sierra 10.13 6 dmg file
Maximum compatibility with professional legacy software requiring a 32-bit architecture backdrop. Method 1: The Official Apple Route (App Store & Terminal) Double-click the InstallOS
By following these official channels and proper installation techniques, you can safely deploy macOS High Sierra 10.13.6 to preserve historical software workflows or bring reliable performance back to your classic Mac hardware. It will install an app named Install macOS
Insert your USB flash drive. Right-click the TransMac icon and select .
To assist you further, could you tell me (Mac or Windows) you are currently using to prepare the installer, and what specific Mac model you plan to install High Sierra on? Share public link