I have a Windows Server 2012 R2 64bit Print Server
In "Print Management" I right-click on my Brother MFC-8420DN printer and choose "Porperties". Then under "Advanced" tab I used the "New Driver" button to install the latest 64bit driver for Windows 2012 R2 from brother.com (http://support.brother.com/g/b/downloadlist.aspx?c=us&lang=en&prod=mfc8480dn_us&os=10002)
Adding the driver went fine without a hitch. Now my new driver appears in the "Driver" list. Currently it is using the driver "Brother Laser Leg Type1 Class Driver".
I change the driver to "Brother MFC-8480DN Printer."
Click "Apply". Error window appears:
Printer settings could not be saved. This operation is not supported.
:(