Unity MonoBehaviour and Photon Confusion

I don't know how to program, but I'm trying to get an old Unity mobile game to run that seems to have used aspects of Photon.
using UnityEngine;

namespace Photon
{
    public class MonoBehaviour : MonoBehaviour
    {
    }
}

This seems to be where most of the errors are coming from, and it's effecting code like:
using Photon;
using UnityEngine;

public class ShowInfoOfPlayer : MonoBehaviour
{
    public float CharacterSize;
    public Font font;
    public bool DisableOnOwnObjects;
}

Everything is either a Circular Base Class Dependency issue or an Ambiguous Reference in the monobehaviours.
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