I've been going through sorting the soundtracks for the Endless titles and have discovered that tracks five (Dust Sense [Forgotten Theme]) and eight (Shadows [Forgotten]) from the "Echoes of Auriga" soundtrack are completely missing. I deleted the 'soundtrack' subdirectory from the game's folder, verified the game's integrity, and after downloading a fresh copy they are still missing. Those tracks just never get downloaded. For reference, since the game numbers that album sequentially and appends it to the Endless Legend soundtrack, they are tracks 37 and 40 in the list. 

I wasn't sure where else to put this thread, but if it needs moved go ahead and do so mods. It'd also be helpful to get some feedback on others whether or not these tracks exist for you. I created a poll for it at the top of the thread. Thanks!

I have them. I bought all the DLC, didn't do anything special so can't say what's different for you and me.

Interesting indeed. I am missing a few DLCs, yes; maybe that is what's doing it? I was under the impression that the entire soundtrack was to be included in the Echoes of Auriga DLC, which I possess. Thanks for the feedback!