PLEASE HELP A NOVICE FIND HALION WITHIN CUBASE

I am very new, and I have Cubase LE AI Elements 8. I have rang them directly by phone, and no luck. I bought a focusrite audio interface, and Cubase came with that. I downloaded Cubase, entered the activation code for the e licenser for Cubase, for the programme as a whole. Now it is saying ‘no valid license found for halion sonic se’.

So I need a separate license for a plugin within a programme which itself needs a different license? If so how confusing and f**king irritating.

Is it possible to return to the page where u first downloaded all the bits and bobs for the programme?

Any help on this would be so appreciated, I just want to make some music !!!

love xxx