All of our presets are installed automatically when you install the plugins themselves. Since our presets are handled by the host and not within the plugin GUI, you do not see the presets because they didn't get installed; instead, Studio One is not seeing them.
To fix this, right-click and 'refresh' the plugin in the top right corner of the effects section, which should add the presets.
You can also check the Studio One folder in "Program Files" for Windows or "Applications" for Mac to see if the presets are in there.