The Kontakt library is only for KONTAKT FULL version and will not work with Kontakt Player. Please check before buying any Kontakt sample library. https://www.native-instruments.com/en/products/komplete/samplers/kontakt-6-player/kontakt-6-player-vs.-kontakt-6/
Here is more info available on the web;
Kontakt Player is a free version of the Kontakt sample playback engine available to download HERE. It works with libraries that the developer has paid a license fee for. Essentially, the developer buys you this playback engine.
The Kontakt player gives you full access to all the sounds and all the editable parameters on the front panel. Also, unlike non-Player libraries, these libraries will also be available to load from the Kontakt Libraries pane.
If the library you want to use is NOT a ‘Player’ library, then you need to buy the full retail version of Kontakt.
Please note that non-Player library instruments will not appear in the Kontakt libraries pane and will not need to be authorized in Native Access as Player libraries need to be. Instead, these libraries will need to be loaded via the Kontakt files browser or you can add the library as a favourite to the Kontakt Quick Load window. Instruction on how to set up Quick Load can be found HERE.
Here is a video from realitone stating the differences: