A guide to installing Lightroom Presets that works for both Windows and Mac versions of Lightroom 5.
Step 1: Open Lightroom Preferences
Open Lightroom preferences and click the Presets Tab.
Click the ‘Show Lightroom Presets‘ folder button.
Step 2: Copy your preset into the correct folder.
This is pretty simple, just look for the folder that corresponds to your preset. In this example, you can see the Local Adjustment Presets folder open which contains some of the default Lightroom presets as well as my JH Enhance Clouds Preset.
Once you have copied your preset to the corresponding folder, restart Lightroom and you will see your presets in their place in the Develop Module.