exe not working if Unity not installed

So I build the exe application and it works fine on my computer. It also works fine on someone else's computer that has Unity installed.

Running the same application on a computer that has no Unity installed and it behaves weird.

For instance, LineRenderer does not render, some Http request calls fail. It does not prevent the app to run, just goes wrong in some cases.

I would think Unity installed some libraries on my computer so the app finds them.

Is development build only working with Unity? Could it be the experimental runtime version?
I will try them as well but in case.

Would there be any way to ensure the running computer has all needed libraries?

Thanks