If you already have High Sierra installed but need to reach version 10.13.5, the "Combo Update" is the official method. Apple hosts a direct .dmg file that upgrades your OS to 10.13.5.
Once you have a valid .dmg or .iso :
Run gibMacOS.bat (on Windows) or gibMacOS.command (on macOS). top download macos high sierra 10135 image file rdr
October 2025 Checked for correctness: macOS High Sierra 10.13.5 is no longer supported by Apple. Use at your own risk on air-gapped or internal networks only. If you already have High Sierra installed but
Since 10.13.5 is no longer listed on the Mac App Store, the "Top Download" sources often come from community-driven preservation projects. One highly referenced source in the search results is the GitHub repository. top download macos high sierra 10135 image file rdr