Hello!Thank you for your question. I am Shefin and I look forward to helping you with your issue today.
Please be informed that there is no driver available for the printer that is compatible with Mac OS X 10.11. I would suggest you try Image Capture and if the issue persists, I would suggest you get another printer/scanner.
Scan using Image Capture : http://www.switchingtomac.com/tutorials/how-to-scan-in-os-x-using-image-capture/
S H E F I N