Since High Sierra is an older OS, it does not receive active security updates from Apple. Ensure you have antivirus software and use secure browsing practices. If you are downloading the installer from unofficial, third-party sites (not via Mist or the App Store link), you should verify the file integrity to prevent security issues.
Introduced in 10.13.6, allowing multi-room audio for iTunes. download+macos+high+sierra+10136+exclusive
Terminal will show a text-based progress bar. Once complete, the installer will appear in your Applications folder. Creating a Bootable USB Installer Since High Sierra is an older OS, it