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I think I know what the problem is — I should have installed the DLC in the 'game' folder, not the <GAME>'s folder( root directory)

Sorry to bother you, I've added the DLC in the game's root directory.  

However, I haven't encountered Reona's second storyline in the  game  (only Bree's part is available) even by the 2 spring （and l ensure my knowledge level stays at 80 more). Could this be because the DLC isn't properly activated?