Software >
https://dortania.github.io/OpenCore-Legacy-Patcher/
Apple stops providing support and a download for old hardware. However, it is possible to force an install. The project that is responsible for this magic has achieved something truly spectacular, making it trivially easy using this GUI software.
WARNING: This is an extremely stupid and dangerous process to attempt without reading, understanding, and preparing the whole process up front. See #.spiralofhope.com/83891/opencore-legacy-patcher.html#plan. It really is very easy and works 100% for "only fairly ancient" hardware, but "very ancient" hardware might not be fully supported (yet?).
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