You can either run their automated installer or install it manually.
I prefer manual installation because, automated installer install many unnecessary tools in my system.
1. locate the ML-1660 from the Unified driver PPD while adding printer:
2.Copy the filter, depending on your system (32bit or 64bit):
/cdroot/Linux/x86_64/at_root/usr/lib64/cups/filter/rastertosamsungspl –> /usr/lib/cups/filter/
3. You may need to install libtiff and splix or may try to modify the ML-1660.ppd for splix support. But, be inform that, from splix website “Splix won’t support old SPL(1) printers.”