Refactored code. Added update checking for KF3TL.

UI/PopupMessage.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+public class PopupMessage : MonoBehaviour
+{
+    public Text Content;
+    public float MessageTime;
+
+    public System.Action OnFinishedAction;
+
+    public PopupMessage Init(string message, float time = 2)
+    {
+        Content.text = message;
+        MessageTime = time;
+        gameObject.SetActive(true);
+        return this;
+    }
+
+    private void Update()
+    {
+        if (MessageTime > 0)
+        {
+            MessageTime -= Time.deltaTime;
+
+            if (MessageTime <= 0)
+            {
+                OnFinishedAction?.Invoke();
+                Destroy(gameObject);
+            }
+        }
+    }
+
+    public void OnClick()
+    {
+        Destroy(this.gameObject);
+        OnFinishedAction?.Invoke();
+    }
+}

UI/ProgressSlider.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+public class ProgressSlider : MonoBehaviour
+{
+    public Slider SlUpdateProgress;
+    public Text TextUpdateProgress;
+
+    public void SetUpdateProgress(float value)
+    {
+        if (value == 0 || value >= 1) { SetActive(false); }
+        else
+        {
+            SetActive(true);
+            SlUpdateProgress.value = value;
+            TextUpdateProgress.text = $"{Mathf.Round(value * 10000) / 100}%";
+        }
+    }
+
+    public void SetActive(bool active)
+    {
+        gameObject.SetActive(active);
+    }
+}

UI/SettingsPanel.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+public class SettingsPanel : MonoBehaviour
+{
+    public UpdateHandler Handler;
+    public Dropdown DdRepository;
+    public InputField InRepositoryUrl;
+
+    public Text TextUpdaterVersion;
+    public Text TextTranslatorVersion;
+    public Text TextTranslationVersion;
+
+    private bool _settingsChanged;
+
+    public SettingsPanel Init(string updaterVersion)
+    {
+        _settingsChanged = false;
+        TextUpdaterVersion.text = "Updater Version: " + updaterVersion;
+        TextTranslatorVersion.text = "KF3TL Version:\n" + PlayerPrefs.GetString(UpdateHandler.TRANSLATOR_VER, "undefined");
+        TextTranslationVersion.text = "Translation Version:\n" + PlayerPrefs.GetString(UpdateHandler.TRANSLATION_VER, "undefined");
+
+        int mode = PlayerPrefs.GetInt(UpdateHandler.REPO_CUSTOM_NAME, 0);
+        OnSourceDropdown(mode);
+        DdRepository.SetValueWithoutNotify(mode);
+
+        _settingsChanged = false;
+        gameObject.SetActive(true);
+        transform.SetAsLastSibling();
+        return this;
+    }
+
+    public void OnSourceDropdown(int choice)
+    {
+        switch (choice)
+        {
+            case 0:
+                PlayerPrefs.SetInt(UpdateHandler.REPO_CUSTOM_NAME, 0);
+                InRepositoryUrl.text = UpdateHandler.REPO_DEFAULT;
+                InRepositoryUrl.interactable = false;
+                break;
+            case 1:
+                PlayerPrefs.SetInt(UpdateHandler.REPO_CUSTOM_NAME, 1);
+                InRepositoryUrl.text = PlayerPrefs.GetString(UpdateHandler.REPO_CUSTOM_URL, UpdateHandler.REPO_DEFAULT);
+                InRepositoryUrl.interactable = true;
+                break;
+        }
+        PlayerPrefs.Save();
+        _settingsChanged = true;
+    }
+
+    public void OnSourceEditFinished(string text)
+    {
+        PlayerPrefs.SetString(UpdateHandler.REPO_CUSTOM_URL, text);
+        PlayerPrefs.Save();
+        _settingsChanged = true;
+    }
+
+    public void OnClearTranslatorButton()
+    {
+        PlayerPrefs.SetString(UpdateHandler.TRANSLATOR_VER, "undefined");
+        PlayerPrefs.Save();
+        TextTranslatorVersion.text = "KF3TL Version:\n" + PlayerPrefs.GetString(UpdateHandler.TRANSLATOR_VER, "undefined");
+        _settingsChanged = true;
+    }
+
+    public void OnClearTranslationButton()
+    {
+        PlayerPrefs.SetString(UpdateHandler.TRANSLATION_VER, "undefined");
+        PlayerPrefs.Save();
+        TextTranslationVersion.text = "Translation Version:\n" + PlayerPrefs.GetString(UpdateHandler.TRANSLATION_VER, "undefined");
+        _settingsChanged = true;
+    }
+
+    public void OnSettingsClose()
+    {
+        if (_settingsChanged)
+        {
+            Handler.StopAllCoroutines();
+            Destroy(Handler.gameObject);
+            UpdateHandler.Create();
+            return;
+        }
+        gameObject.SetActive(false);
+    }
+}

UI/UpdateAvailable.cs

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+using System.Collections;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class UpdateAvailable : MonoBehaviour
+{
+    public Text Header;
+    public Text CurrentVersion;
+    public Text NewVersion;
+    public System.Action OnDownloadAction;
+    public System.Action OnIgnoreAction;
+    public System.Action OnIgnorePersistentAction;
+    public Button IgnorePersistentButton;
+
+    public UpdateAvailable Init(string title, string currentVersion, string newVersion)
+    {
+        Header.text = title;
+        CurrentVersion.text = "Current: " + currentVersion;
+        NewVersion.text = "Update: " + newVersion;
+        gameObject.SetActive(true);
+        return this;
+    }
+
+    public void OnDownload()
+    {
+        OnDownloadAction?.Invoke();
+    }
+
+    public void OnIgnore()
+    {
+        OnIgnoreAction?.Invoke();
+    }
+
+    public void OnIgnorePersistent()
+    {
+        OnIgnorePersistentAction?.Invoke();
+    }
+}

UI/UpdateChecker.cs

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+using UnityEngine;
+
+public class UpdateChecker : MonoBehaviour
+{
+    public UpdateHandler Handler;
+
+    public void OpenSettings()
+    {
+        Handler.OpenSettingsDetached();
+    }
+
+    public void SetActive(bool active)
+    {
+        gameObject.SetActive(active);
+    }
+}