I didn’t plan to become the neighborhood “vintage Mac paramedic,” but an old 2010 MacBook Pro landed on my desk with a dead drive and a request: “Can you bring it back with El Capitan?” I only had a Windows PC nearby. If you’ve been here: you know the feeling—half nostalgia, half “why is this so unnecessarily hard?”
This write-up is the guide I wish someone handed me. It’s not a tool pitch, and it’s not a copy-paste of random forum steps. It’s a user-centered route that balances reliability, reversibility, and risk management when you must build an OS X El Capitan installer from Windows.