I have a shoot coming up where I need to provide 4x6 prints to the client's guests nearly immediately after making the photographs so they can take the photo with them that evening.  Research led me to the Canon CP100 printer, a dye sublimation system that puts paper and dye sub film into a single box.  My MacBook Pro runs El Capitan, the current shipping operating system from Apple.  As I have found in the past, Canon's installer is OS version specific, even when it makes no sense to do so.  I would be stuck, except for Pacifist.