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Sorry for the late reply. I've downloaded the game off of Itch.io, and have everything in one folder: Mono(folder), DinosauriaAlpha2Win_Data(folder), the Dinosauria application to run the game, the Unity crash handler,  and the unity player.  Is there something I need to move/change? That's how it came downloaded.

It is supposed to just work so long as all of the files are in the same folder an a computer, and that computer meets the minimum requirements to run Unity: https://unity3d.com/unity/system-requirements.

Alternatively you can install the itch.io client, and download/play Dinosauria with the itch.io client.

I am not familiar enough with the error to remotely troubleshoot.