diff --git a/nginx.conf b/nginx.conf
index 2a12dc8..2f7415a 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -3,6 +3,12 @@ server {
     root /usr/share/nginx/html;
     index index.html;
 
+    # index.html은 캐싱 금지 (배포 후 즉시 반영)
+    location = /index.html {
+        try_files $uri =404;
+        add_header Cache-Control "no-store, no-cache, must-revalidate";
+    }
+
     # SPA fallback (react-router 사용 시 필요)
     location / {
         try_files $uri $uri/ /index.html;
diff --git a/src/components/admin/AdminCommon.css b/src/components/admin/AdminCommon.css
index 1d0ef75..8a0bf0d 100644
--- a/src/components/admin/AdminCommon.css
+++ b/src/components/admin/AdminCommon.css
@@ -67,6 +67,12 @@
   border-color: rgba(186, 205, 176, 0.5);
 }
 
+.admin-error {
+  font-size: 0.85rem;
+  color: rgba(229, 115, 115, 0.9);
+  margin: 0;
+}
+
 .admin-form-actions {
   display: flex;
   gap: 8px;
diff --git a/src/components/admin/DownloadAdmin.jsx b/src/components/admin/DownloadAdmin.jsx
index 415478c..103169d 100644
--- a/src/components/admin/DownloadAdmin.jsx
+++ b/src/components/admin/DownloadAdmin.jsx
@@ -7,6 +7,7 @@ export default function DownloadAdmin() {
   const [form, setForm] = useState({ url: '', version: '', fileName: '', fileSize: '', fileHash: '' });
   const [loading, setLoading] = useState(false);
   const [saved, setSaved] = useState(false);
+  const [error, setError] = useState('');
 
   useEffect(() => {
     getDownloadInfo()
@@ -23,6 +24,7 @@ export default function DownloadAdmin() {
   const handleSubmit = async (e) => {
     e.preventDefault();
     setLoading(true);
+    setError('');
     try {
       await apiFetch('/api/download/info', {
         method: 'PUT',
@@ -30,6 +32,8 @@ export default function DownloadAdmin() {
       });
       setSaved(true);
       setTimeout(() => setSaved(false), 2000);
+    } catch (err) {
+      setError(err.message || '저장에 실패했습니다.');
     } finally {
       setLoading(false);
     }
@@ -56,6 +60,7 @@ export default function DownloadAdmin() {
         {field('파일명', 'fileName', 'A301_Launcher.zip')}
         {field('파일 크기', 'fileSize', '1.2 GB')}
         {field('A301.exe SHA256 해시', 'fileHash', 'sha256 해시값 (certutil -hashfile A301.exe SHA256)')}
+        {error && <p className="admin-error">{error}</p>}
         <div className="admin-form-actions">
           <button className="btn-admin-primary" type="submit" disabled={loading}>
             {saved ? '저장됨 ✓' : '저장'}