I installed a new SSD in this 2009 early 24" iMac. Which required starting at macOS X, then Lion, then Moutain Lion, and finally El Capitan 10.11.6. But now I am stuck. OCLP requires High Sierra although this iMac will not let me install anything past El Capitan.
What have other done to install OCLP on 2009 early 24" iMac?
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