Steinberg have changed a number of things in the way this update is delivered. I you click the version and edition you’ve purchased in the left-hand pane of the Download Assistant, you’ll see all the relevant components listed in the right-hand pane. There’s not a single, massive download this time (which is great for people without always-on unmetered internet access) so you can download the bits you need. For example, if you don’t do EDM, you might choose not to download some of the Content Sets.
To get the equivalent of a “full install”, just click the “Cubase Pro 11” icon on the left and download all the items listed on the right.
It’s explained in the “Read Me” document and in the video here.