For TA: Kingdoms

So I just beat "The Book of Darien" campaign (final level first attempt: 2 hours death no save start from scratch; much cursing. Second attempt: race like madman 30 mins finish, multiple paranoid saves) and the ending for video for, I would guess, "Iron Plague" campaign plays.

Anyone know how to get the original campaign ending to run? Or at least someway I can watch the video?

I've the same problem:installing Iron Plague overwrites the original ending video with the expansion one:this happens also for the original intro video.
The only way to prevent is installing TA:Kingdoms without the expansion, beating the Book of Darien campaign and after installing the expansion.
Otherwise download RAD Video Tools (is free) and use them for read the cinematics.