Just follow the instructions as below, using the new installer version. Update October 2, 2016: Lots of folks have reported that this works with El Capitan and I’ve used it with macOS Sierra as well. It’s possible for that Mac to boot in under 30 seconds and to jump generations ahead for under $200. If you have an iMac with Thunderbolt or USB 3 but without an SSD you can boot from a full-speed external SSD without opening the case.
