diff --git a/QuickLook.Common/Helpers/ProcessHelper.cs b/QuickLook.Common/Helpers/ProcessHelper.cs
index 2afebbb..35262cc 100644
--- a/QuickLook.Common/Helpers/ProcessHelper.cs
+++ b/QuickLook.Common/Helpers/ProcessHelper.cs
@@ -16,6 +16,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 using System;
+using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Threading.Tasks;
@@ -63,6 +64,8 @@ namespace QuickLook.Common.Helpers
 
         public static void WriteLog(string msg)
         {
+            Debug.WriteLine(msg);
+
             var logFilePath = Path.Combine(SettingHelper.LocalDataPath, @"QuickLook.Exception.log");
 
             using (var writer = new StreamWriter(new FileStream(logFilePath, FileMode.OpenOrCreate,
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/Plugin.cs
index c0d93f2..5bb906a 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/Plugin.cs
@@ -33,12 +33,12 @@ namespace QuickLook.Plugin.PluginInstaller
 
         public bool CanHandle(string path)
         {
-            return !Directory.Exists(path) && path.ToLower().EndsWith(".qlviewer");
+            return !Directory.Exists(path) && path.ToLower().EndsWith(".qlplugin");
         }
 
         public void Prepare(string path, ContextObject context)
         {
-            context.PreferredSize = new Size { Width = 400, Height = 172 };
+            context.PreferredSize = new Size { Width = 460, Height = 200 };
 
             context.Title = "";
             context.TitlebarOverlap = false;
@@ -50,7 +50,7 @@ namespace QuickLook.Plugin.PluginInstaller
 
         public void View(string path, ContextObject context)
         {
-            context.ViewerContent = new PluginInfoPanel(path);
+            context.ViewerContent = new PluginInfoPanel(path, context);
 
             context.IsBusy = false;
         }
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml b/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml
index 694466c..4420267 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml
+++ b/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml
@@ -4,7 +4,7 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
              FontSize="14"
-             mc:Ignorable="d" Width="400" Height="172" UseLayoutRounding="True">
+             mc:Ignorable="d" Width="460" Height="200">
     <UserControl.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml.cs
index f536695..fe73360 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/PluginInfoPanel.xaml.cs
@@ -16,19 +16,24 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 using System;
-using System.Globalization;
 using System.IO;
 using System.IO.Compression;
+using System.Threading.Tasks;
+using System.Windows;
 using System.Windows.Controls;
 using System.Xml;
+using QuickLook.Common.ExtensionMethods;
+using QuickLook.Common.Plugin;
 
 namespace QuickLook.Plugin.PluginInstaller
 {
     public partial class PluginInfoPanel : UserControl
     {
+        private readonly ContextObject _context;
         private readonly string _path;
+        private string _namespace;
 
-        public PluginInfoPanel(string path)
+        public PluginInfoPanel(string path, ContextObject context)
         {
             InitializeComponent();
 
@@ -36,19 +41,87 @@ namespace QuickLook.Plugin.PluginInstaller
             Resources.MergedDictionaries[0].Clear();
 
             _path = path;
+            _context = context;
             ReadInfo();
+
+            btnInstall.Click += BtnInstall_Click;
         }
 
+        private void BtnInstall_Click(object sender, RoutedEventArgs e)
+        {
+            btnInstall.Content = "Installing ...";
+            btnInstall.IsEnabled = false;
+
+            var t=DoInstall();
+            t.ContinueWith(_ =>
+                Dispatcher.BeginInvoke(new Action(() => btnInstall.Content = "Done! Please restart QuickLook.")));
+            t.Start();
+        }
+
+        private Task DoInstall()
+        {
+            var targetFolder = Path.Combine(App.UserPluginPath, _namespace);
+            return new Task(() =>
+            {
+                CleanUp();
+
+                try
+                {
+                    ZipFile.ExtractToDirectory(_path, targetFolder);
+                }
+                catch (Exception ex)
+                {
+                    Dispatcher.BeginInvoke(new Action(() => description.Text = ex.Message));
+                    CleanUp();
+                }
+            });
+
+            void CleanUp()
+            {
+                if (!Directory.Exists(targetFolder))
+                {
+                    Directory.CreateDirectory(targetFolder);
+                    return;
+                }
+
+                try
+                {
+                    Directory.GetFiles(targetFolder, "*", SearchOption.AllDirectories)
+                        .ForEach(file => File.Move(file, new Guid() + ".to_be_deleted"));
+                }
+                catch (Exception ex)
+                {
+                    Dispatcher.BeginInvoke(new Action(() => description.Text = ex.Message));
+                }
+            }
+        }
+
+
         private void ReadInfo()
         {
             filename.Text = Path.GetFileNameWithoutExtension(_path);
 
-            var xml = LoadXml(GetFileFromZip(_path, "Metadata.config"));
+            var xml = LoadXml(GetFileFromZip(_path, "QuickLook.Plugin.Metadata.config"));
+
+            _namespace = GetString(xml, @"/Metadata/Namespace");
+
+            var okay = _namespace != null && _namespace.StartsWith("QuickLook.Plugin.");
+
+            filename.Text = okay ? _namespace : "Invalid plugin.";
+            description.Text = GetString(xml, @"/Metadata/Description", string.Empty);
+
+            btnInstall.Visibility = okay ? Visibility.Visible : Visibility.Collapsed;
         }
 
-        private XmlDocument LoadXml(Stream data)
+        private static string GetString(XmlNode xml, string xpath, string def = null)
         {
+            var n = xml?.SelectSingleNode(xpath);
 
+            return n?.InnerText;
+        }
+
+        private static XmlDocument LoadXml(Stream data)
+        {
             var doc = new XmlDocument();
             try
             {
@@ -61,18 +134,26 @@ namespace QuickLook.Plugin.PluginInstaller
             }
         }
 
-        private Stream GetFileFromZip(string archive, string entry)
+        private static MemoryStream GetFileFromZip(string archive, string entry)
         {
             var ms = new MemoryStream();
 
-            using (var zip = ZipFile.Open(archive, ZipArchiveMode.Read))
+            try
             {
-                using (var s = zip.GetEntry(entry)?.Open())
+                using (var zip = ZipFile.Open(archive, ZipArchiveMode.Read))
                 {
-                    s?.CopyTo(ms);
+                    using (var s = zip?.GetEntry(entry)?.Open())
+                    {
+                        s?.CopyTo(ms);
+                    }
                 }
             }
+            catch (Exception)
+            {
+                return ms;
+            }
 
+            ms.Position = 0;
             return ms;
         }
     }
diff --git a/QuickLook/App.xaml.cs b/QuickLook/App.xaml.cs
index 4b02637..2dd0efd 100644
--- a/QuickLook/App.xaml.cs
+++ b/QuickLook/App.xaml.cs
@@ -34,6 +34,7 @@ namespace QuickLook
     /// </summary>
     public partial class App : Application
     {
+        public static readonly string UserPluginPath = Path.Combine(SettingHelper.LocalDataPath, "QuickLook.Plugin\\");
         public static readonly string AppFullPath = Assembly.GetExecutingAssembly().Location;
         public static readonly string AppPath = Path.GetDirectoryName(AppFullPath);
         public static readonly bool Is64Bit = Environment.Is64BitProcess;
diff --git a/QuickLook/PluginManager.cs b/QuickLook/PluginManager.cs
index cf174db..d465dc8 100644
--- a/QuickLook/PluginManager.cs
+++ b/QuickLook/PluginManager.cs
@@ -22,6 +22,7 @@ using System.IO;
 using System.Linq;
 using System.Reflection;
 using QuickLook.Common.ExtensionMethods;
+using QuickLook.Common.Helpers;
 using QuickLook.Common.Plugin;
 
 namespace QuickLook
@@ -32,7 +33,10 @@ namespace QuickLook
 
         private PluginManager()
         {
-            LoadPlugins();
+            CleanupOldPlugins(App.UserPluginPath);
+            LoadPlugins(App.UserPluginPath);
+            LoadPlugins(Path.Combine(App.AppPath, "QuickLook.Plugin\\"));
+            InitLoadedPlugins();
         }
 
         internal IViewer DefaultPlugin { get; } = new Plugin.InfoPanel.Plugin();
@@ -74,9 +78,12 @@ namespace QuickLook
             return (matched ?? DefaultPlugin).GetType().CreateInstance<IViewer>();
         }
 
-        private void LoadPlugins()
+        private void LoadPlugins(string folder)
         {
-            Directory.GetFiles(Path.Combine(App.AppPath, "QuickLook.Plugin\\"), "QuickLook.Plugin.*.dll",
+            if (!Directory.Exists(folder))
+                return;
+
+            Directory.GetFiles(folder, "QuickLook.Plugin.*.dll",
                     SearchOption.AllDirectories)
                 .ToList()
                 .ForEach(
@@ -90,7 +97,10 @@ namespace QuickLook
                     });
 
             LoadedPlugins = LoadedPlugins.OrderByDescending(i => i.Priority).ToList();
+        }
 
+        private void InitLoadedPlugins()
+        {
             LoadedPlugins.ForEach(i =>
             {
                 try
@@ -99,7 +109,25 @@ namespace QuickLook
                 }
                 catch (Exception e)
                 {
-                    Debug.WriteLine(e);
+                    ProcessHelper.WriteLog(e.ToString());
+                }
+            });
+        }
+
+        private static void CleanupOldPlugins(string folder)
+        {
+            if (!Directory.Exists(folder))
+                return;
+
+            Directory.GetFiles(folder, "*.to_be_deleted", SearchOption.AllDirectories).ForEach(file =>
+            {
+                try
+                {
+                    File.Delete(file);
+                }
+                catch (Exception)
+                {
+                    // ignored
                 }
             });
         }