Unzip the preset pack you downloaded.
Serum 2 (and Serum 1, as the process is identical). how to install serum 2 presets
In Serum, click the Menu button → "Show Serum Presets Folder" . Unzip the preset pack you downloaded
Installing presets for Serum 2 is straightforward, but there are two main methods: (full control) and the Preferred Method (using the built-in preset browser). I strongly recommend the second method. Method 1: The Preferred & Easiest Method (Using the Serum Presets Folder) This method keeps all your presets organized inside Serum’s own directory, making them appear automatically in the plugin’s browser. how to install serum 2 presets
Select "Add Folder to Favorites..." and navigate to the folder where you unzipped your new presets.