If you have access to an older Mac that is officially supported by High Sierra, or a Mac running an older OS like Sierra or El Capitan, you can download the installer directly from Apple using a native browser link. Open on your Mac.
If you are upgrading an older Mac containing a third-party solid-state drive, the installer may struggle to convert the file system. Ensure your SSD firmware is fully updated before attempting the macOS High Sierra upgrade.
Once you have the installer application, you can easily burn it to a physical USB drive (minimum 14GB required). Plug in your USB flash drive. download macos high sierra 10136 dmg mac top
softwareupdate --fetch-full-installer --full-installer-version 10.13.6
When downloading older software, safety is paramount. Stick to official or highly trusted sources. Here are the best methods: If you have access to an older Mac
Use the terminal command createinstallmedia to make a bootable drive:
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Before starting, ensure you have a complete backup of your Mac.
This frequent error usually points to an outdated security certificate within the installer file. You can easily bypass this by temporarily disconnecting your Mac from the internet, opening the Terminal during the installation recovery screen, and typing date 0101010118 (which rolls your system clock back to January 1st, 2018).