So it seems that all issues are fixed.
If You want to, You can buy Vectron here - https://k-trains.com/en/produkt/vectron-class-193/.
I really hope that no more issues will appear and I can now with calm head go to school.
If anybody managed to get Vectron here and the installer was not working, most of the used keys should be cleared of the used activations, so don´t worry about that.
I wish You many great kilometres with this loco and hope You will like it and it won´t disappoint You.
Thank you very much.
I bought it yesterday, but unfortunately I haven't received a download link yet.