Having trouble installing a Panasonic KX-MB2030 printer on mac?

Just bought a new all-in-one printer, scanner, copy & fax machine for my office. But I'm using an iMac and there is no CD to install this printer on iMac. I did however find a .dmg file which is the driver for the printer, and I tried to install it according to the instruction but it still would not work. Can someone please help?