diff --git a/pom.xml b/pom.xml
index 879188b..8079237 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
   <groupId>istlab.KisoJikkenNWP</groupId>
   <artifactId>KisoJikkenNWP</artifactId>
   <packaging>jar</packaging>
-  <version>0.3</version>
+  <version>0.4</version>
   <name>KisoJikkenNWP</name>
   <url>http://maven.apache.org</url>
 
diff --git a/src/main/java/istlab/KisoJikken/Launcher.java b/src/main/java/istlab/KisoJikken/Launcher.java
index bcf36ed..ae5bbec 100644
--- a/src/main/java/istlab/KisoJikken/Launcher.java
+++ b/src/main/java/istlab/KisoJikken/Launcher.java
@@ -1,13 +1,22 @@
 package istlab.KisoJikken;
 
+import java.awt.Desktop;
 import java.awt.BorderLayout;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
 import java.awt.event.MouseEvent;
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
+import java.nio.channels.Channels;
+import java.nio.channels.FileChannel;
+import java.nio.channels.ReadableByteChannel;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.security.CodeSource;
@@ -31,16 +40,23 @@
 
     public static Launcher theapp;
     public static String version = "0.3";
+    public static String downloadurl = "https://cit.istlab.info/KisoJikkenNWP/target/";
+    public static Path execPath;
     // JPanel mainP;
     JTree tree;
     Hashtable<File, Editor> file2editor;
 
     public Launcher(String[] args) {
-        super("Kiso NWP Launcher v"+version);
+        super("Kiso NWP Launcher v" + version);
         setDefaultCloseOperation(EXIT_ON_CLOSE);
         // mainP = new JPanel();
         file2editor = new Hashtable<File, Editor>();
         theapp = this;
+        try {
+            execPath = getApplicationPath(this.getClass());
+        } catch (URISyntaxException e) {
+            e.printStackTrace();
+        }
 
         File root;
         if (args.length > 0)
@@ -70,14 +86,22 @@
         // Menu
         JMenuBar menuBar = new JMenuBar();
         JMenu menu = new JMenu("App");
-        JMenuItem mi = new JMenuItem("show Version");
-        mi.addActionListener(ae -> JOptionPane.showMessageDialog(this, "Kiso NWP Launcher v"+version));
+        JMenuItem mi = new JMenuItem("show version");
+        mi.addActionListener(ae -> JOptionPane.showMessageDialog(this, "Kiso NWP Launcher v" + version));
         menu.add(mi);
 
-        mi = new JMenuItem("download Latest");
+        mi = new JMenuItem("download latest");
         mi.addActionListener(ae -> downloadLatest());
         menu.add(mi);
 
+        mi = new JMenuItem("open download site");
+        mi.addActionListener(ae -> openURL(downloadurl));
+        menu.add(mi);
+
+        mi = new JMenuItem("open JAR folder");
+        mi.addActionListener(ae -> openExecPath());
+        menu.add(mi);
+
         menuBar.add(menu);
         setJMenuBar(menuBar);
 
@@ -86,22 +110,81 @@
     }
 
     public void downloadLatest() {
+        // 最初に、ダウンロードサイトから最新版の情報を得る
+        // 更新があれば、ダウンロードし、ファイルを表示する。
+        StringBuilder sb = new StringBuilder();
+        String latestVersion=null;
         try {
-            System.out.println(getApplicationPath(this.getClass()));
-        } catch (URISyntaxException e) {
-            e.printStackTrace();
+            URL url = new URL(downloadurl);
+            InputStream is = url.openConnection().getInputStream();
+            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
+            String line = null;
+            while ((line = reader.readLine()) != null) {
+                if (latestVersion==null) latestVersion = line.trim();
+                System.out.println(line);
+                sb.append(line+"\n");
+            }
+            reader.close();
+        } catch (Exception ex) {
+        }
+        // System.out.println(sb.toString());
+//同じかどうかチェック
+        System.out.println("["+latestVersion+"]");
+        System.out.println("="+execPath.getFileName()+"=");
+
+        if (latestVersion.equals(execPath.getFileName().toString())){
+            JOptionPane.showMessageDialog(this, "This is latest version : v"+version);
+        } else {
+            int res = JOptionPane.showConfirmDialog(this, "Download "+latestVersion+"??");
+            if (res==JOptionPane.YES_OPTION){
+                try {
+                    URL url = new URL(downloadurl+"/"+latestVersion);
+                    ReadableByteChannel readableByteChannel = Channels.newChannel(url.openStream());
+                    FileOutputStream fileOutputStream = new FileOutputStream(latestVersion);
+                    FileChannel fileChannel = fileOutputStream.getChannel();
+                    fileOutputStream.getChannel().transferFrom(readableByteChannel, 0, Long.MAX_VALUE);
+                    fileChannel.close();
+                    fileOutputStream.close();
+                } catch (Exception ex) {
+                } finally {
+                }
+                openExecPath();
+            }
         }
 
     }
 
+    public void openExecPath() {
+        File execFolder = execPath.getParent().toFile();
+        openFolder(execFolder);
+    }
+
+    public void openFolder(File path) {
+        try {
+            Desktop.getDesktop().open(path);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void openURL(String url) {
+        if (Desktop.isDesktopSupported() && Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
+            try {
+                Desktop.getDesktop().browse(new URI(url));
+            } catch (IOException | URISyntaxException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
     public static Path getApplicationPath(Class<?> cls) throws URISyntaxException {
-		ProtectionDomain pd = cls.getProtectionDomain();
-		CodeSource cs = pd.getCodeSource();
-		URL location = cs.getLocation();
-		URI uri = location.toURI();
-		Path path = Paths.get(uri);
-		return path;
-	}
+        ProtectionDomain pd = cls.getProtectionDomain();
+        CodeSource cs = pd.getCodeSource();
+        URL location = cs.getLocation();
+        URI uri = location.toURI();
+        Path path = Paths.get(uri);
+        return path;
+    }
 
     @Override
     public void mouseClicked(MouseEvent e) {