I'm setting up an Epson 3880, using a Mac Pro with Yosemite (OS 10.10.5). I've downloaded Quadtone RIP and Print Tool, installed them in the Applications folder, and restarted the computer. The printer is loaded and ready to go. Print Tool is open, I've loaded a picture into it, and clicked on Print. When I click on Layout in the next window, however, the Quadtone RIP option is not visible for me to choose. What step have I missed?!