It's easy to install design presets.
We'll install this Vertical Gene Higa Design. Just note the three letter extension. We'll need that.
Click Design Installer
Click the "<<" Button and navigate to the templates you want to use.
Here I've chosen the folder. Note the 3 letter extension (in this case "ghb").
Here I'll choose "ghb"
If the extension is not there, enter it here and name your preset.
Click install to load the sets.
You'll be notified how many presets were installed.
Click on "DesignMatic"(1) then choose a template from the set you just created (2). Then you'll see a preview of that set.