Here's some good content about downloading macOS High Sierra 10.13.6 DMG:

To get the authentic, full installer securely from Apple, follow these steps on a compatible Mac:

Mail Improvement: Fixes a bug that hindered Gmail users from moving messages to another account within the Mail app.

If you have a compatible Mac, this is the most secure way to get the installer. It will download an file to your Applications

  1. Go to the Apple Support website (https://support.apple.com).
  2. Click on "Mac" at the top of the page.
  3. Click on "macOS High Sierra" from the dropdown menu.
  4. Click on "How to get old versions of macOS" at the bottom of the page.
  5. Click on the "macOS High Sierra" link.
  6. Click on the "Download" button.

Before downloading, ensure your hardware is compatible. Generally, if your Mac could run macOS Sierra (10.12), it can run High Sierra.

While Apple has hidden older versions from the primary Mac App Store search results, they remain available through specific official channels.

Mac OS High Sierra 10.13.6 is a popular operating system for Macs, offering a range of features and improvements, including:

Once the installer app is in your Applications folder, you can create your own bootable media or DMG: Format a USB Drive Disk Utility