diff --git a/appinfo/application.php b/appinfo/application.php
index 1541c44..8b20479 100644
--- a/appinfo/application.php
+++ b/appinfo/application.php
@@ -36,7 +36,11 @@ class Application extends App
         });
 
         $container->registerService('Youtube', function (IContainer $container) {
-            return new Youtube(['downloadDir' => $this->getRealDownloadDir()]);
+            $config = [
+                'binary' => $this->settings->setType(Settings::TYPE['SYSTEM'])->get("ncd_yt_binary"),
+                'downloadDir' => $this->getRealDownloadDir(),
+            ];
+            return new Youtube($config);
         });
 
         $container->registerService('Settings', function (IContainer $container) {
@@ -112,8 +116,14 @@ class Application extends App
         if (is_array($customSettings = $this->settings->getAria2())) {
             $settings = array_merge($customSettings, $settings);
         }
-        $token = $this->settings->setType(1)->get('ncd_rpctoken');
-        $config = ['dir' => $realDownloadDir, 'conf_dir' => $aria2_dir, 'token' => $token, 'settings' => $settings];
+        $token = $this->settings->setType(Settings::TYPE['SYSTEM'])->get('ncd_rpctoken');
+        $config = [
+            'dir' => $realDownloadDir,
+            'conf_dir' => $aria2_dir,
+            'token' => $token,
+            'settings' => $settings,
+            'binary' => $this->settings->setType(Settings::TYPE['SYSTEM'])->get('ncd_aria2_binary'),
+        ];
         return $config;
     }
 
diff --git a/appinfo/info.xml b/appinfo/info.xml
index e7f0cae..a7972a4 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -5,7 +5,7 @@
     <summary>Aria2 and youtube-dl web gui for nextcloud</summary>
     <description>built-in torrent search;Start and stop Aria2 process, manage Aria2 from the web;
 Download videos from youtube, twitter and other sites;</description>
-    <version>0.1.2</version>
+    <version>0.1.3</version>
     <licence>agpl</licence>
     <author mail="freefallbenson@gmail.com" homepage="https://github.com/shiningw">jiaxinhuang</author>
     <namespace>NCDownloader</namespace>
diff --git a/lib/Controller/SettingsController.php b/lib/Controller/SettingsController.php
index bd4d277..ff01cb3 100644
--- a/lib/Controller/SettingsController.php
+++ b/lib/Controller/SettingsController.php
@@ -48,7 +48,7 @@ class SettingsController extends Controller
 
     public function admin()
     {
-        $this->settings->setType($this->settings::SYSTEM);
+        $this->settings->setType($this->settings::TYPE['SYSTEM']);
         $params = $this->request->getParams();
         foreach ($params as $key => $value) {
             if (substr($key, 0, 1) == '_') {
diff --git a/lib/Settings/Admin.php b/lib/Settings/Admin.php
index 677d466..fc2f234 100644
--- a/lib/Settings/Admin.php
+++ b/lib/Settings/Admin.php
@@ -32,7 +32,7 @@ class Admin implements ISettings {
 	 * @return TemplateResponse
 	 */
 	public function getForm() {
-		$this->settings->setType($this->settings::SYSTEM);
+		$this->settings->setType($this->settings::TYPE['SYSTEM']);
 		$parameters = [
 			"path" => "/apps/ncdownloader/admin/save",
 			"ncd_yt_binary" => $this->settings->get("ncd_yt_binary"),
diff --git a/lib/Tools/Aria2.php b/lib/Tools/Aria2.php
index 26bfc75..ebaccbc 100644
--- a/lib/Tools/Aria2.php
+++ b/lib/Tools/Aria2.php
@@ -340,7 +340,7 @@ class Aria2
     }
     public function isInstalled()
     {
-        return (bool) isset($this->bin);
+        return (bool) (isset($this->bin) && @is_executable($this->bin));
     }
     public function isRunning()
     {
diff --git a/lib/Tools/Helper.php b/lib/Tools/Helper.php
index 2e8e5b2..22ce44f 100644
--- a/lib/Tools/Helper.php
+++ b/lib/Tools/Helper.php
@@ -9,6 +9,7 @@ class Helper
 {
     public const DOWNLOADTYPE = ['ARIA2' => 1, 'YOUTUBE-DL' => 2, 'OTHERS' => 3];
     public const STATUS = ['ACTIVE' => 1, 'PAUSED' => 2, 'COMPLETE' => 3, 'ERROR' => 4];
+
     public static function isUrl($URL)
     {
         $URLPattern = '%^(?:(?:https?|ftp)://)(?:\S+(?::\S*)?@|\d{1,3}(?:\.\d{1,3}){3}|(?:(?:[a-z\d\x{00a1}-\x{ffff}'
diff --git a/lib/Tools/Settings.php b/lib/Tools/Settings.php
index 9bc196c..e4357b0 100644
--- a/lib/Tools/Settings.php
+++ b/lib/Tools/Settings.php
@@ -17,15 +17,13 @@ class Settings extends AllConfig
 
     //type of settings (system = 1 or app =2)
     private $type;
-    const SYSTEM = 0x001;
-    const USER = 0x010;
-    const APP = 0x100;
+    public const TYPE = ['SYSTEM' => 0x001, 'USER' => 0x010, 'APP' => 0x100];
     public function __construct($user = null)
     {
         $this->appConfig = \OC::$server->getAppConfig();
         $this->sysConfig = \OC::$server->getSystemConfig();
         $this->appName = 'ncdownloader';
-        $this->type = self::USER;
+        $this->type = self::TYPE['USER'];
         $this->user = $user;
         $this->allConfig = new AllConfig($this->sysConfig);
         //$this->connAdapter = \OC::$server->getDatabaseConnection();
@@ -38,9 +36,9 @@ class Settings extends AllConfig
     }
     public function get($key, $default = null)
     {
-        if ($this->type == self::USER && isset($this->user)) {
+        if ($this->type == self::TYPE['USER'] && isset($this->user)) {
             return $this->allConfig->getUserValue($this->user, $this->appName, $key, $default);
-        } else if ($this->type == self::SYSTEM) {
+        } else if ($this->type == self::TYPE['SYSTEM']) {
             return $this->allConfig->getSystemValue($key, $default);
         } else {
             return $this->allConfig->getAppValue($this->appName, $key, $default);
@@ -53,7 +51,7 @@ class Settings extends AllConfig
     }
     public function getAll()
     {
-        if ($this->type === self::APP) {
+        if ($this->type === self::TYPE['APP']) {
             return $this->getAllAppValues();
         } else {
             $data = $this->getAllUserSettings();
@@ -63,9 +61,9 @@ class Settings extends AllConfig
     }
     public function save($key, $value)
     {
-        if ($this->type == self::USER && isset($this->user)) {
+        if ($this->type == self::TYPE['USER'] && isset($this->user)) {
             return $this->allConfig->setUserValue($this->user, $this->appName, $key, $value);
-        } else if ($this->type == self::SYSTEM) {
+        } else if ($this->type == self::TYPE['SYSTEM']) {
             return $this->allConfig->setSystemValue($key, $value);
         } else {
             return $this->allConfig->setAppValue($this->appName, $key, $value);
diff --git a/lib/Tools/Youtube.php b/lib/Tools/Youtube.php
index f0693cf..56e6b9f 100644
--- a/lib/Tools/Youtube.php
+++ b/lib/Tools/Youtube.php
@@ -21,7 +21,7 @@ class Youtube
     public function __construct($config)
     {
         $config += ['downloadDir' => '/tmp/downloads'];
-        $this->bin = Helper::findBinaryPath('youtube-dl');
+        $this->bin = $config['binary'] ?? Helper::findBinaryPath('youtube-dl');
         $this->init();
         $this->setDownloadDir($config['downloadDir']);
     }
@@ -183,7 +183,7 @@ class Youtube
     }
     public function isInstalled()
     {
-        return (bool) isset($this->bin);
+        return (bool) (isset($this->bin) && @is_executable($this->bin));
     }
     public static function install()
     {
diff --git a/src/settings.js b/src/settings.js
index da10ec9..0306294 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -13,9 +13,10 @@ import helper from './helper';
 window.addEventListener('DOMContentLoaded', function () {
 
     eventHandler.add('click', '.ncdownloader-admin-settings', 'input[type="button"]', function (event) {
-        e.stopPropagation();
+        event.stopPropagation();
         OC_msg.startSaving('#ncdownloader-message-banner');
         const target = this.getAttribute("data-rel");
+        let inputData = helper.getData(target);
         const path = inputData.url || "/apps/ncdownloader/admin/save";
         let url = generateUrl(path);
         Http.getInstance(url).setData(helper.getData(target)).setHandler(function () {
diff --git a/templates/settings/Admin.php b/templates/settings/Admin.php
index 6ffc842..dee6921 100644
--- a/templates/settings/Admin.php
+++ b/templates/settings/Admin.php
@@ -1,11 +1,12 @@
 <?php
 script("ncdownloader", 'appSettings');
+extract($_);
 ?>
 <div class="ncdownloader-admin-settings">
     <form id="ncdownloader" class="section">
         <h2>ncDownloader admin Settings</h2>
         <div>
-            <span id="ncdownloader-message"></span>
+            <span id="ncdownloader-message-banner"></span>
         </div>
         <div id="ncd_rpctoken_settings" path="<?php print $path;?>">
             <label for="ncd_rpctoken">
@@ -16,5 +17,23 @@ script("ncdownloader", 'appSettings');
                 placeholder="ncdownloader123" />
             <input type="button" value="<?php print($l->t('Save'));?>" data-rel="ncd_rpctoken_settings" />
         </div>
+        <div id="ncd_yt_binary_container" path="<?php print $path;?>">
+            <label for="ncd_yt_binary">
+                <?php print($l->t('Youtube-dl Binary Path'));?>
+            </label>
+            <input type="text" class="ncd_yt_binary" id="ncd_yt_binary" name="ncd_yt_binary"
+                value="<?php print($ncd_yt_binary ?? '/usr/local/bin/youtube-dl');?>"
+                placeholder='/usr/local/bin/youtube-dl' />
+            <input type="button" value="<?php print($l->t('Save'));?>" data-rel="ncd_yt_binary_container" />
+        </div>
+        <div id="ncd_aria2_binary_container" path="<?php print $path;?>">
+            <label for="ncd_aria2_binary">
+                <?php print($l->t('Aria2 Binary Path'));?>
+            </label>
+            <input type="text" class="ncd_aria2_binary" id="ncd_aria2_binary" name="ncd_aria2_binary"
+                value="<?php print($ncd_aria2_binary ?? '/usr/bin/aria2c');?>"
+                placeholder="/usr/bin/aria2c" />
+            <input type="button" value="<?php print($l->t('Save'));?>" data-rel="ncd_aria2_binary" />
+        </div>
   </form>
 </div>
\ No newline at end of file