There are all those content set downloads like Halion Sonic SE -content set and Groove Agent SE 2 -content set, but there is no installer for any of those, so where are you suppose to put them?
Press install after download in the Download Assistant.
Thanks. Yes, I found that you could install them using the download assistant.
Once you download the content from the Steinberg Download Assistant, you can click to the Install button in the Steinberg Download Assistant. Installed, done.