Cubase extra files?

How does Cubase manage the extra sound packs and installation files for each release?
If I install Cubase 8.5 then Cubase 9 then Cubase 9.5 with the full 10GB installation do they share resources? Or would this take up 30GB?

(So far I have not been installing the extra packages due to hard drive space. But just got a new computer!)

It shares the media files, so it won’t install multiple places.