I need to buy a used MacBook Pro because El Capitan breaks CS5 (among other things). Few MacBooks are being sold with 10.8. Most are sold with "the latest software yay!" (Mavericks, Yosemite, or El Capitan), so i will need to downgrade. Has anyone here accomplished this? This link tells you how to downgrade, so I am not requesting instructions, but advice. My questions are: 1. Have any HW upgrades by previous owner prevented a downgrade? 2. What tool did you use to remove the boot partitian (since El Capitan tries to prevent downgrading)? Any other advice or experiences are appreciated!