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You don’t need third-party tools. Use Apple’s built-in createinstallmedia :

Once the download is complete, the "Install macOS High Sierra" app will be in your Applications folder. To create a bootable USB: Connect a USB drive (at least 16GB). download+macos+high+sierra+10136+exclusive

The installer will download directly to your folder. 4. Creating a Bootable USB (Optional) You don’t need third-party tools

Let me know, and I can walk you through the Terminal commands to create one. Приложение «macOS High Sierra - App Store download+macos+high+sierra+10136+exclusive