Yes, you are probably confusing AES credits for KORD to the actual KORD scenery. The KORD scenery is sold here, and is activated using the Addon Manager menu, as explained in the supplied manual.
AES credits for KORD are not an FSDT products, they are sold by Aerosoft and are used to enable AES service vehicles on KORD, but you need to purchase KORD first, they don't work stand-alone.