Older installers may have expired certificates. If the installer fails, try changing your Mac's date to 2017 in Terminal using date 010101012017 .
Minimum 8.8 GB of available disk space for the installer files.
Disclaimer: This guide is intended for educational purposes. Always use caution when modifying system software. Using older operating systems may have security limitations. If you're interested, I can also:
Open and erase the drive using the following parameters:
If you are currently running macOS Mojave or later, you can use the built-in Terminal command-line tool to fetch full installers directly from Apple's software update servers. Step-by-Step Instructions Open the app (found in Applications > Utilities). Type or paste the following command exactly as shown:
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