My wife was just given an hand-me-down 2009 iMac 27" (iMac 10,1) for her department and it's still on Snow Leopard. I want to get it to High Sierra, which is the latest version it can handle. I've purchased a Mountain Lion install from Apple and now I'm just trying to think of how to proceed.
Do I have to do anything special to do this like USB drives or other external drives to do the install from, or can I just upgrade in place? The plan is to update to Mountain Lion, then download High Sierra from the App Store and upgrade that.
Do I have to do anything special to do this like USB drives or other external drives to do the install from, or can I just upgrade in place? The plan is to update to Mountain Lion, then download High Sierra from the App Store and upgrade that.
