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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.

whenever i try to play it says "put it next to the excutable." can you help?

It is the executable that is giving an error message stating: "put it next to the excutable.".

It might be that you are trying to run it from the archive, which it cannot; here is a video I found demonstrating this: