diff --git a/src/btn.ts b/src/btn.ts
index 844b611..9b009db 100644
--- a/src/btn.ts
+++ b/src/btn.ts
@@ -105,12 +105,12 @@ export namespace BtnAction {
     })
   }
 
-  export const download = (url: UrlInput, filename?: string): BtnAction => {
+  export const download = (url: UrlInput): BtnAction => {
     return process(async (): Promise<any> => {
       const _url = await normalizeUrlInput(url)
-      const r = await fetch(_url)
-      const blob = await r.blob()
-      saveAs(blob, filename)
+      const a = document.createElement('a')
+      a.href = _url
+      a.dispatchEvent(new MouseEvent('click'))
     })
   }
 
diff --git a/src/main.ts b/src/main.ts
index 8b63e82..edc3d7c 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -42,13 +42,13 @@ const main = (): void => {
   btnList.add({
     name: 'Download MIDI',
     action: BtnAction.deprecate(
-      BtnAction.download(() => getFileUrl('midi'), `${filename}.mid`),
+      BtnAction.download(() => getFileUrl('midi')),
     ),
   })
 
   btnList.add({
     name: 'Download MP3',
-    action: BtnAction.download(() => getFileUrl('mp3'), `${filename}.mp3`),
+    action: BtnAction.download(() => getFileUrl('mp3')),
   })
 
   btnList.add({