Bought new iMac and a hub so I can connect my printer and other items via usb. In system settings/printers and scanners/add printer it sees the connection but the list of software available is about 10 items most are label printers. I have downloaded the Brother drivers and Brother iPrintandScan in downloads but they are greyed out and I cannot open them. Have had 9 years with a MacBook without any issues. Although it does not recognise the printer I can print from a pdf so the printer is connected and working. Any ideas?