From what I can tell, only Golden Century is suddenly not appearing. It doesn't show up in the launcher and shows up as "Not Owned" in game, despite it being owned and installed.
I have viewed a bunch of recent and older threads with purchased DLC's not showing up and have done a full clean reinstall, and have tried uninstalling the launcher and deleting folders etc.
I have viewed a bunch of recent and older threads with purchased DLC's not showing up and have done a full clean reinstall, and have tried uninstalling the launcher and deleting folders etc.