Recently I had bought brother printer for my mac and I was very excited.But my happiness doesn't last long as I was totally stuck into installing brother printer on mac. So to download driver for macOS version 10.11 I visited apple download page, but it could not proceed to install the driver as it asked me to enter administrator password. I forgot the admin password on my Mac and tried to find articles on different forums and website for resetting the password and thank god i came across https://iguruservices.com/support/reset-mac-admin-password/ post which helped me reset my Mac admin password. And then I installed the brother printer driver which is working fine now.