Since I passed to El Capitan, good'ol Create Booklet 1.2 (http://www.macupdate.com/app/mac/21068/create-booklet) won't work anymore (it used to be free, but is now paid for). All the available booklet creation programs cost something and I simply can't afford them.
So I went on a hunt to use Automator and/or AppleScript. I only found this site which does not seem to be maintained anymore, I also tried to contact the webmaster/owner, but none of the available e-mail addresses work (they came back with a delivery failure): http://automatorworld.com/archives/create-pdf-booklet/
Does anyone have an idea how to create such an applet for Mac?
What would be the (mathematical?) formula and/or the routine to start such a project with Automator/AppleScript?