Instead of chasing an unreliable, potentially malicious DMG, you can build a clean, updatable, stable Hackintosh using the OpenCore bootloader. Here’s the modern workflow for High Sierra (compatible with most Intel 2nd to 7th gen CPUs and select AMD GPUs).
Honestly? Never. Even if you’re on a 2009 Core 2 Duo laptop with broken keyboard and no access to any Mac, the better path is to use macrecovery.py (OpenCore built-in internet recovery tool) to fetch a genuine base image, then manually patch with legacy kexts for your hardware.
If you simply want to experience High Sierra as a curiosity in a virtual machine: Use the official High Sierra VMDK from Apple’s developer download (requires free Apple ID) + VirtualBox/VMware. No Niresh required.
macOS is licensed only for genuine Apple hardware. Distributing modified DMG files violates Apple’s EULA. Downloading such images is software piracy.