Updater.cs

using UnityEngine;
using System.Collections;
using SimpleJSON;
using System.Diagnostics;

public class Updater : MonoBehaviour {
	
	public string currentVersion = "1.0.0.0";
	
	public string baseUrl = "http://localhost/GAME_NAME_here/"; //Base URL for your game
	public string versionsFile = "versions.json"; //JSON file that contains the updates
	
	// Use this for initialization
	void Start () {
		string[] data = System.Environment.GetCommandLineArgs();
		
		WWW www = new WWW(baseUrl + versionsFile);
		StartCoroutine(WaitForWWW(www));
	}
	
	IEnumerator WaitForWWW(WWW www){
		yield return www;
		
		if (www.error == null){
			UnityEngine.Debug.Log("Recieved from (" + www.url+ "): " + www.text);
			JSONNode data = JSON.Parse(www.text);
			JSONArray updates = data["updates"].AsArray;
			
			foreach (JSONNode update in updates){
				if (string.Equals(update["version"], currentVersion)){
					UnityEngine.Debug.Log("Update found.. Going to run updater.");
					
					ProcessStartInfo start = new ProcessStartInfo();
					start.FileName = "Updater.exe"; // Should be the name of the updater application
					Process proc = new Process();
					proc.StartInfo = start;
					
					proc.Start();//sTART THE UPDATER
										
					Application.Quit(); //Stop the game so updater can override file
				}
			}
			
		}else{
			UnityEngine.Debug.Log("Error: " + www.error + " @ " + www.url);
		}
		
	}
}