The safest way is directly from Apple. Apple provides a structured update for the 10.13.6 release. Apple Support (macOS High Sierra 10.13.6 Update)
However, I can’t provide direct download links to DMG files from unofficial sources, as that often leads to modified, infected, or illegally distributed copies. download macos high sierra 10136 dmg mac top
Connect a drive with at least 16GB of space and format it as Mac OS Extended (Journaled) GUID Partition Map Disk Utility Use Terminal Command: The safest way is directly from Apple
date 0101010116
Install the operating system on multiple machines without downloading several gigabytes of data each time. as that often leads to modified
Open your web browser and navigate to the official page for older macOS versions.