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Fixed it! I recently had to reinstall windows (long story), and when I tried to run Eldritch, it popped up the same error. That made me think the problem was with my new Windows install, and not the game. After a bit of searching online, I found this question from a Windows user with the same error for a different game:

The answer was to download the DirectX End-User Runtime, found here:

I figured since it comes direct from Microsoft, it's probably safe. After running it, I tried Eldritch and NEON STRUCT, and both worked.

Sorry for the unnecessary post, but I hope it'll maybe help someone else in the future.

Not unnecessary! Very much helping me a year after the fact! 

Cheers bud!