First of all, you have to download the free presets and unzip them. Then copy the folder with the presets. Now you can add them to Lightroom. Here's how to go about it:
- go to Lightroom > Preferences
- Then click on Show Lightroom preset folder in the Presets tab.
- Then go to Lightroom > Develop Presets, and paste the folder with the presets.In this case we added some presets from Serge Ramelli into Lightroom
- Now restart Lightroom and voila! The presets are ready to use.