Note that a valid FX Central subscription is required for downloading the Sapphire Presets. 

Generally, When you download a Sapphire preset collection from FX Central (http://www.genarts.com/fx-central/look-collections), you get a .gpz file. For example, the February Collection file looks like this: “S_2013-February-Collection.gpz”

Note: Depending on your web browser download setting, you may download the file as a “.zip”. If that happens, you can rename the “.zip” extension to “.gpz”.

To install, double click on the .gpz file and the files will automatically be installed to your preset collection. A prompt will show:  "Installed ## new presets."  Then, click on "Ok". The next time you start your host application, the Sapphire presets should show up in your preset collection.