Showcase Simple Self-Updater Implementation (Free script!)

After going back and forth searching for an easy way to update my app, I wrote this simple self-updater implementation. It's nothing super innovative, but figured it might be useful nonetheless!

All of the options on the asset store are for patching, which is great but in my case not needed as the application is relatively small. Previously I was checking for updates from a JSON file on my website, then opening the download page if the user wants to "Update Now". But I wanted to automate it even further, giving the illusion of a launcher without the need for an extra application.

The script includes some UI code (progress bar) which can be easily altered to fit your needs.
(Switching to a different scene is an idea, instead of showing a UI element). It also automatically resizes the game window to give the illusion of a separate application, but that can be removed easily if not needed.

I'm open to any feedback or suggestions!

Spoiler

Code (CSharp):

1.  
2. #if UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN || UNITY_WSA || UNITY_WSA_10_0 || WINDOWS_UWP
3. #define UNITY_WINDOWS
4. #endif
5.  
6. using System;
7. using System.Collections;
8. using System.Collections.Generic;
9. using System.IO;
10. using UnityEngine;
11. using UnityEngine.Networking;
12.  
13. public class AutoUpdater : MonoBehaviour
14. {
15.     // set the web urls to your installer downloads
16.     public string macInstallerPath, windowsInstallerPath;
17.    
18.     // to change the window size during download, set it here
19.     public Vector2Int downloaderWindowSize;
20.    
21.     private Vector2Int initialWindowSize;
22.     private string downloadingFilePath;
23.     private string downloadFolder;
24.  
25.     [Header("UI")]
26.     // UI to show/hide when downloading
27.     public GameObject downloadUI;
28.     public UnityEngine.UI.Image progressBar;
29.     public TMPro.TextMeshProUGUI progressText;
30.     public UnityEngine.UI.Button cancelButton;
31.    
32.     UnityWebRequest uwr;
33.     private bool cancelled = false;
34.     private void Start()
35.     {
36.         initialWindowSize = new Vector2Int(Screen.currentResolution.width, Screen.currentResolution.height);
37.         cancelButton.onClick.AddListener(CancelDownload);
38.  
39.         downloadFolder = Application.temporaryCachePath;
40.        
41.         // Setup your executable names here
42. #if UNITY_WINDOWS
43.         downloadingFilePath = Path.Combine(downloadFolder, "Installer.exe");
44. #else
45.         downloadingFilePath = Path.Combine(downloadFolder, "Installer.pkg");
46. #endif
47.  
48.         // delete the old installer from the temp path if it exists
49.         if (File.Exists(downloadingFilePath))
50.             File.Delete(downloadingFilePath);
51.  
52.     }
53.  
54.     public void BeginUpdate()
55.     {
56.         Debug.Log("BEGINNING UPDATED VERSION DOWNLOAD");
57.  
58.         downloadUI.gameObject.SetActive(true);
59.         Screen.SetResolution(downloaderWindowSize.x, downloaderWindowSize.y, FullScreenMode.Windowed);
60.  
61.         StartCoroutine(BeginWebRequest());
62.     }
63.  
64.     public void CancelDownload()
65.     {
66.         Debug.Log("CANCELLING");
67.         if (uwr == null || uwr.isDone) return;
68.  
69.         uwr.disposeDownloadHandlerOnDispose = true;
70.         uwr.Abort();
71.         cancelled = true;
72.         Screen.SetResolution(initialWindowSize.x, initialWindowSize.y, FullScreenMode.Windowed);
73.         downloadUI.gameObject.SetActive(false);
74.     }
75.  
76.     private IEnumerator BeginWebRequest()
77.     {
78.         cancelled = false;
79. #if UNITY_WINDOWS
80.         string url =windowsInstallerPath;
81. #else
82.         string url = macInstallerPath;
83. #endif
84.         uwr = new UnityWebRequest(url, UnityWebRequest.kHttpVerbGET);
85.         uwr.disposeDownloadHandlerOnDispose = true;
86.         uwr.downloadHandler = new DownloadHandlerFile(downloadingFilePath);
87.         uwr.SendWebRequest();
88.         yield return null;
89.          
90.         // handle progress bar/text
91.         while (!uwr.isDone)
92.         {
93.             progressBar.fillAmount = uwr.downloadProgress;
94.             progressText.text = (Math.Round(uwr.downloadProgress, 2) * 100f).ToString() + " %";
95.             yield return new WaitForSeconds(0.2f);
96.         }
97.         uwr.Dispose();
98.  
99.         if (!cancelled)
100.         {
101.             // open the new installer and close the current game.
102.             System.Diagnostics.Process.Start(downloadingFilePath);
103.             Application.Quit();
104.         }
105.     }
106.  
107.    
108. }

Also hosted here:
https://gist.github.com/SceneForgeStudio/f10f1464683227e00f83c6dde54fb2fe