I bought Session Horns as a separate product. It wasn't cheap either and nowhere was I told beforehand that I would not be able to play a solo instrument with keyswitches for articulation changes, a pretty basic requirement, or so you would have thought.
I wanted my money back but Native Instruments refused and treated me badly so I refuse to buy any more of their products. Yes I could have got that functionality by upgrading to the "Session Horns Pro" version, but that one product is about one third the price of the Komplete Ultimate bundle so very poor value. Not only that but the upgrade prices on the full version of Kontakt are ridiculous for little benefit. I don't want my hard disk filled with other stuff which I will never use so my opinion of Native Instruments and Kontakt is very negative I'm afraid.