Important clarification: If you meant (10.15), that is a common target for patchers. If you truly meant El Capitan (10.11) — that OS runs natively on Macs from 2007–2009 easily. This guide assumes you want a newer OS (like Catalina, Big Sur, or Monterey) on an unsupported Mac, but the title says “Capitan” — I’ll cover both possibilities. Guide: Installing macOS on an Unsupported Mac Part 1: Did you actually mean El Capitan (10.11)? If your Mac is from mid-2007 to late 2009 , El Capitan is the last officially supported version. You don’t need a hack — just download it from Apple (if previously purchased) or use a bootable USB.