you can use any version of Mac os ( we use a power mac g-5 and a new 27 inch imac with yosemite, were waiting to see the bugs in el cap) Just make a hot folder on your rip/ search from your mac for(via shared folder) hot folder. we print using postscript. we have no issues doing it this way. trying to point direct using appletalk is a prob because so few computers use it now. try the hot folder