How to download macOS High Sierra 10.13.5 (image file) — safe, legal steps

Software Needed:

You must use R-Drive Image to open, read, or restore these files .

macOS High Sierra 10.13.5

The update was a key release for the operating system, notably introducing support for Messages in iCloud . While Apple typically provides macOS as an .app file through the App Store or as a .dmg file for updates, the .rdr format is a proprietary disk image format developed by R-Tools Technology for use with software like R-Drive Image or R-Studio . These files are often used in technical communities for restoring entire disk partitions rather than standard installations. Understanding the .rdr Format

Step 2:

Ensure you have R-Drive Image installed on a Windows PC to "burn" the RDR file to a USB drive.

  1. Boot into Recovery (Cmd+R).
  2. Use diskutil list to find the Recovery HD.
  3. Create a .dmg of that partition: 
    dd if=/dev/diskXsY of=HighSierraRecovery.dmg bs=1m
  1. Connect a USB drive with at least 8GB of free space.
  2. Open the Disk Utility app on your Mac.
  3. Select the USB drive and click on "Erase."
  4. Choose "Mac OS Extended (Journaled)" as the format and click "Erase."
  5. Open the Terminal app and type the following command: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/USB_DRIVE_NAME

macOS High Sierra 10.13.5 is no longer supported by Apple. All security updates, patches, and App Store signing certificates for this version have been deprecated.

Before proceeding, it is critical to state the following: Downloading operating system files from third-party websites (especially those with cryptic "rdr hot" labels) carries significant risks, including malware, modified kernels, and disabled security features.

Alternative Method: Download from the Mac App Store