Why is my C# code giving me compatability issues?

Hey, I'm trying to create an Oculus rift look-to-fly simulator, and am using a C# script as detailed in a tutorial. However, when I try to do so, I'm getting a bunch of compatibility errors and this might be because I'm using Unity 5, when the guy who created the script was on Unity 4. Here's my code:

 using UnityEngine;
 using System.Collections;
 
 public class Flying : MonoBehaviour {
 
         public GameObject oculusLeftEye;     
         Rigidbody rr;          
         public float forwardSpeed = 100f;     
         float rotationSpeed = 300f; 
 
         Vector3 axis;     
         float rotationY;     
         float rotationX;     
         float rotationZ;
 
         bool start = false;  
 
         // Use this for initialization     
         void Start () {         
             rr = GetComponent<Rigidbody> ();     
         }          
         // Update is called once per frame     
         void Update () {                  
             if (Input.GetKey (KeyCode.Space)) {                          
                 start = true;
             }
             if(start == true)           
             {                          
                 FlightMode();         
             }              
         }                    
         void FlightMode(){                  
             //get rotation values for the leftEye         
             rotationX = oculusLeftEye.transform.localRotation.x / 2;        
             rotationY = oculusLeftEye.transform.localRotation.y / 2;      
             rotationZ = oculusLeftEye.transform.localRotation.z;              
 
             //put them into a vector        
             axis = new Vector3 (rotationX, rotationY, rotationZ);   
 
             //Rotate
             transform.Rotate (axis * Time.deltaTime * rotationSpeed);  
 
             rr.velocity = oculusLeftEye.transform.forward * forwardSpeed;  
         }
 }
 

Is there anything I could do to fix these errors?

Edit: The errors I'm getting are this: it opens up OVRUnityVersionChecker.cs and says Backing field for automatically implemented property OVRUnityVersion.major must be fully assigned.

From this I can get that there must be some sort of version compatability issue but I have absolutely no experience with Unity, so I was hoping someone who's had a similar problem can help me...

Thank you in advance for any help!