I "save link as..." directly into the WinFF file. I opened WinFF, but the original presets are still there.
Using Windows, it will normally say 'This file already exists, do you want to replace it?' or something similar. If you are not seeing this message, then you are probably saving into the wrong folder.
Try actually locating the original presets.xml file first, so that you know where to copy the downloaded one to.