The Discover tab is where you'll find and download new content for INSTRUMENT. By scrolling through the main Discover page you can view all of the available packs, and see their category and the specific Label that they come from.
You can download content by clicking the download button on the Pack as shown below. This will download the entire Pack in one click.
Alternatively you can click into the pack art and download or preview individual Presets from that Pack.
From the pack's page, you can also preview the preset by clicking on the waveform.
Once a preset has been downloaded, you can load it here by clicking the 'Load' box to the right of a preset. This will take you back to the Play tab, where you can control more of the parameters for the plugin.