Had the same problem. Solved it by downloading the dark below that just said baught in psn store then i could by ttk. Dident matter that i had baught it and downloaded the dark below months ago. Hope my English wasnt to bad.
English
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It was pretty bad I'm confused really really confused
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:-) down load the ad-ons again ( house of wolfs and the dark below )from playstation network . It helped me. Better?