diff --git a/src/main/java/org/cubewhy/celestial/Celestial.java b/src/main/java/org/cubewhy/celestial/Celestial.java
index 073f74d9..8a713457 100644
--- a/src/main/java/org/cubewhy/celestial/Celestial.java
+++ b/src/main/java/org/cubewhy/celestial/Celestial.java
@@ -3,6 +3,7 @@
 import com.formdev.flatlaf.FlatDarkLaf;
 import com.formdev.flatlaf.FlatLightLaf;
 import com.formdev.flatlaf.IntelliJTheme;
+import com.formdev.flatlaf.json.Json;
 import com.google.gson.*;
 import joptsimple.OptionParser;
 import joptsimple.OptionSet;
@@ -221,11 +222,24 @@ private static void initConfig() {
         resize.addProperty("width", 854);
         resize.addProperty("height", 480);
 
+        JsonObject addon = new JsonObject();
+        // weave
+        JsonObject weave = new JsonObject();
+        weave.addProperty("enable", false);
+        weave.addProperty("check-update", true);
+        addon.add("weave", weave);
+        // lccn
+        JsonObject lunarcn = new JsonObject();
+        lunarcn.addProperty("enable", false);
+        lunarcn.addProperty("check-update", true);
+        addon.add("lunarcn", lunarcn);
+
         config.initValue("jre", "") // leave empty if you want to use the default one
                 .initValue("language", "zh") // en, zh
                 .initValue("installation-dir", new File(configDir, "game").getPath())
                 .initValue("game-dir", getMinecraftFolder().getPath()) // the minecraft folder
                 .initValue("game", (JsonElement) null)
+                .initValue("addon", addon)
                 .initValue("ram", 4096)
                 .initValue("max-threads", Runtime.getRuntime().availableProcessors()) // recommend: same as your CPU core
                 .initValue("api", "https://api.lunarclient.top") // only support the LunarCN api, Moonsworth's looks like shit :(
diff --git a/src/main/java/org/cubewhy/celestial/event/impl/FileDownloadEvent.java b/src/main/java/org/cubewhy/celestial/event/impl/FileDownloadEvent.java
new file mode 100644
index 00000000..47634eba
--- /dev/null
+++ b/src/main/java/org/cubewhy/celestial/event/impl/FileDownloadEvent.java
@@ -0,0 +1,27 @@
+/*
+ * Celestial Launcher <me@lunarclient.top>
+ * License under GPLv3
+ * Do NOT remove this note if you want to copy this file.
+ */
+
+package org.cubewhy.celestial.event.impl;
+
+import org.cubewhy.celestial.event.Event;
+
+import java.io.File;
+
+public class FileDownloadEvent extends Event {
+
+    public final File file;
+    public final Type type;
+
+    public enum Type {
+        START,
+        SUCCESS, FALURE;
+    }
+
+    public FileDownloadEvent(File file, Type type) {
+        this.file = file;
+        this.type = type;
+    }
+}
diff --git a/src/main/java/org/cubewhy/celestial/files/DownloadManager.java b/src/main/java/org/cubewhy/celestial/files/DownloadManager.java
index 6650f932..083f9b2c 100644
--- a/src/main/java/org/cubewhy/celestial/files/DownloadManager.java
+++ b/src/main/java/org/cubewhy/celestial/files/DownloadManager.java
@@ -4,6 +4,7 @@
 import lombok.extern.slf4j.Slf4j;
 import okhttp3.Response;
 import org.apache.commons.io.FileUtils;
+import org.cubewhy.celestial.event.impl.FileDownloadEvent;
 import org.cubewhy.celestial.utils.RequestUtils;
 import org.jetbrains.annotations.NotNull;
 
@@ -77,9 +78,11 @@ public static boolean download(URL url, @NotNull File file, String sha1) throws
                 return true;
             }
         }
+        new FileDownloadEvent(file, FileDownloadEvent.Type.START).call();
         log.info("Downloading " + url + " to " + file);
         try (Response response = RequestUtils.get(url).execute()) {
             if (!response.isSuccessful() || response.body() == null) {
+                new FileDownloadEvent(file, FileDownloadEvent.Type.FALURE).call();
                 return false;
             }
             byte[] bytes = response.body().bytes();
@@ -87,8 +90,13 @@ public static boolean download(URL url, @NotNull File file, String sha1) throws
         }
         statusBar.setText("Download " + file.getName() + " success.");
         if (sha1 != null) {
-            return SecureUtil.sha1(file).equals(sha1);
+            boolean result = SecureUtil.sha1(file).equals(sha1);
+            if (!result) {
+                new FileDownloadEvent(file, FileDownloadEvent.Type.FALURE).call();
+            }
+            return result;
         }
+        new FileDownloadEvent(file, FileDownloadEvent.Type.SUCCESS).call();
         return true;
     }
 
diff --git a/src/main/java/org/cubewhy/celestial/game/addon/WeaveMod.java b/src/main/java/org/cubewhy/celestial/game/addon/WeaveMod.java
index f6ceaed1..5de6976b 100644
--- a/src/main/java/org/cubewhy/celestial/game/addon/WeaveMod.java
+++ b/src/main/java/org/cubewhy/celestial/game/addon/WeaveMod.java
@@ -18,8 +18,11 @@
 import java.util.List;
 import java.util.Objects;
 
+import static org.cubewhy.celestial.Celestial.config;
+
 @Getter
 public class WeaveMod extends BaseAddon {
+    public static final String build = "Weave-MC/Weave-Loader"; // https://github.com/<build>/releases/latest
     public static final File modFolder = new File(System.getProperty("user.home"), ".weave/mods");
     private final File file;