Cubase AI download problem

Thanks again the very quick ansver.
But unfortunaltely I think I did everithing by this video.

  1. I had a new PC and new windows, I downloaded Download Assistant, and installed it.
  2. I started a reactivation. I wrote the new licence code, got a new activation code. A wrote the act. code to the eLicencer, and Cubase AI apperars right.
  3. Because I can’t download an AI version, I wrote my act. code to the top (“Enter your Download Access code”) row of Download Assistant. It was right. But after this none of Cubase version starts.
    Perhaps this was the mistake?
  4. I tried reactivating again, but I can’t, because I can’t delete the eLicencer row, so it not works.
    (How can I remove a licence from elicencer control center?)
    So now the reactivating mode not works, I can’t copy a new e-licence there to the reactivation panel.

I resintalled everything, but the same situation.
I don’t know why is so difficult!
Perhaps I did a mistake (I don’t find it) - but why can’t I repair it with a deleting or reinstall?
The reactivation works only with virgin windows?