Request for a concrete procedure for an easy upgrade from cubase pro v11 to v12

I’m a bit confused with the change from Steinberg eLicenser to Steinberg Activation Manager.
Would someone be so kind as to post a step-by-step guide on how to do the upgrade?

At this point I have purchased the upgrade from Cubase Pro v11 to v12 and received a Activation Code/Download Access Code.

What do I have to do now and in which order (eLicenser manager, download assistant, activation manager)?

Thanks in advance.

Here you go: