Can't see Descent in Avernus Module anymore.

Hello I want to use some maps for Descent in Avernus, which I played long time ago in other game. I can't see that as an add on. Do you know why, I don't have issue with Tales from the Yawning Portal.

Hi Mert! Baldur's Gate: Descent into Avernus is a module, not an addon. You have to create a game from it and then transmogrify from that game. (Modules cannot be added to existing games, in order to prevent bloat and subsequent drop in performance.) Tales from the Yawning Portal was released as a collection of Addons, since the adventures are shorter, smaller and self-contained.