I'm trying to add a Samsung CLX-2160 printer, but the driver is not in the list of pre-loaded drivers. I've downloaded the driver from Samsung's site, but cannot find it when I add the printer. It's not in the list, and when I click "other" to find it, I can get to the file ("SamsungCLX-216xSeries.ds", in Hard Drive/Library/TWAIN Data Sources), but there is no option to add it. This should be easy...but I'm stuck here.