What's the best way to update Mac mini "Core 2 Duo" 2.4 (Mid-2010) from 10.6.8 to either El Capitan or Sierra or at least something newer than 10.6.8. We do not mind doing fresh install. We have other El Capitan Mac which we could use to create an installation image. Can we just install El Capitan and will it automatically activate and not ask for licence serial number? Will drivers still be available?