diff --git a/_downloads/windows/arm64.md b/_downloads/windows/arm64.md
index 89e0dd7..cc518ce 100644
--- a/_downloads/windows/arm64.md
+++ b/_downloads/windows/arm64.md
@@ -28,12 +28,34 @@ Can't download? [Click here to download (alternative)](https://alist.8mi.tech/d/
 
 
 <script>
-    setTimeout(function() {
+    async function checkUrl(url) {
+        try {
+            const response = await fetch(url, { method: 'HEAD' });
+            return response.ok;
+        } catch {
+            return false;
+        }
+    }
+
+    async function redirect() {
         const isZhCN = /^zh-CN/i.test(navigator.language);
-        const url = isZhCN 
-            ? "https://alist.8mi.tech/d/mirror/ms-jdk/Auto/microsoft-jdk-21-windows-aarch64.msi" 
-            : "https://aka.ms/download-jdk/microsoft-jdk-21-windows-aarch64.msi";
-        location.href = url;
-    }, 5000); // Wait 5 seconds
+        const url1 = "https://alist.8mi.tech/d/mirror/ms-jdk/Auto/microsoft-jdk-21-windows-aarch64.msi";
+        const url2 = "https://aka.ms/download-jdk/microsoft-jdk-21-windows-aarch64.msi";
+
+        const [url1Available, url2Available] = await Promise.all([
+            checkUrl(url1),
+            checkUrl(url2)
+        ]);
+
+        if (url1Available && !url2Available) {
+            window.location.href = url1;
+        } else if (!url1Available && url2Available) {
+            window.location.href = url2;
+        } else {
+            window.location.href = isZhCN ? url1 : url2;
+        }
+    }
+
+    setTimeout(redirect, 5000); // Wait 5 seconds
 </script>
 
diff --git a/_downloads/windows/x86_64.md b/_downloads/windows/x86_64.md
index 1c3fb5b..01e95ba 100644
--- a/_downloads/windows/x86_64.md
+++ b/_downloads/windows/x86_64.md
@@ -28,12 +28,34 @@ Can't download? [Click here to download (alternative)](https://alist.8mi.tech/d/
 
 
 <script>
-    setTimeout(function() {
+    async function checkUrl(url) {
+        try {
+            const response = await fetch(url, { method: 'HEAD' });
+            return response.ok;
+        } catch {
+            return false;
+        }
+    }
+
+    async function redirect() {
         const isZhCN = /^zh-CN/i.test(navigator.language);
-        const url = isZhCN 
-            ? "https://alist.8mi.tech/d/mirror/ms-jdk/Auto/microsoft-jdk-21-windows-x64.msi" 
-            : "https://aka.ms/download-jdk/microsoft-jdk-21-windows-x64.msi";
-        window.location.href = url;
-    }, 5000); // Wait 5 seconds
+        const url1 = "https://alist.8mi.tech/d/mirror/ms-jdk/Auto/microsoft-jdk-21-windows-x64.msi";
+        const url2 = "https://aka.ms/download-jdk/microsoft-jdk-21-windows-x64.msi";
+
+        const [url1Available, url2Available] = await Promise.all([
+            checkUrl(url1),
+            checkUrl(url2)
+        ]);
+
+        if (url1Available && !url2Available) {
+            window.location.href = url1;
+        } else if (!url1Available && url2Available) {
+            window.location.href = url2;
+        } else {
+            window.location.href = isZhCN ? url1 : url2;
+        }
+    }
+
+    setTimeout(redirect, 5000); // Wait 5 seconds
 </script>