Unzip the preset pack you downloaded.
Go up one level (or simply remember the location). You don't need to put presets inside Serum’s folder for this method. how to install serum 2 presets
Serum 2 (and Serum 1, as the process is identical). Unzip the preset pack you downloaded
Select "Add Folder to Favorites..." and navigate to the folder where you unzipped your new presets. how to install serum 2 presets
In Serum, click the Menu button → "Show Serum Presets Folder" .
In Serum’s browser (left side), click the "File" menu at the very top of the browser panel.