Waterdeep Ending Addons?

I just purchased Waterdeep: Dragon Heist and have spent the last four hours trying to solve a key ingredient in the game construction. The game is designed to run in a relatively straight line until Chapter 5 where it can go one of four different directions. You are instructed to "load the addon" for the module you choose to use. I am probably staring right at it, but no matter where I search -- maps, chapters, supplemental material, information outside of the game, etc. -- I cannot find where the four alternates are located to BE loaded in. Could someone direct me to the file or folder where we find these materials?

Nevermind. Less than a minute after I posted that, I found it. For anyone else as blind as I am, it's on the main page, outside of game.  There is a drop-down menu where you pick which ending you want.