Before downloading, confirm which version you need based on your hardware and software requirements: macOS Sierra (10.12):
: If your Mac is compatible, use this Direct App Store Link to open the High Sierra page. Click "Get" or "Download" to receive the "Install macOS High Sierra.app" in your Applications folder.
If you are searching for a "macOS High Sierra 10.12 DMG," you might actually be looking for one of two distinct operating systems. While the names are similar, macOS Sierra is version 10.12 macOS High Sierra is version 10.13
Your Mac must be compatible with High Sierra to download the full installer. 2. Download macOS Sierra (10.12) DMG