I recently purchased an Imac(mid-2009) running El Capitan. It replaced an mid-2007 running Yosemite. I had been using a Brother DSmobile600 pass through scanner. I downloaded the drivers which were compatible up to Yosemite. When I open Printers and Scanners, it is not there. I can, calibrate it with the DS 600 calibrator in my applications folder. Any ideas?