It's because the older iPad won't accept OS 10-the only way to get youtube but here's how I did it. Open Safari, enter Youtube. that's it. and put the icon on the home screen using one of the tabs on top (which I had to open to find) Lesson-Use the simplest way first instead of digging here and there for days-go to youtube and put in your question. In this case "install Youtube on an older iPad."