The Framed mod provides 2 different versions of Chapter 6 and makes going to Candlekeep a possible side quest not involving the Iron Throne. If Candlekeep is visited before the Iron Throne Building is investigated, Eltan will have a different task for the group to be done in Chapter 6. To experience the new version, a work order will need to be obtained from Bentley (Friendly Arm Inn) or Scar (initial meeting only and only if PC admits to clearing the Nashkel mines) during Chapter 5.
Version 1.14 comes with a fix and some optimizations.
Learn more about the mod - View the readme - Visit the forum - Download the mod