diff --git a/various-tools/batch download lister/generation.py b/various-tools/batch download lister/generation.py
index 7f9f62e..52fcc1b 100644
--- a/various-tools/batch download lister/generation.py	
+++ b/various-tools/batch download lister/generation.py	
@@ -1,21 +1,41 @@
 import os
 import json
+import zlib
 
 base_dir = os.getcwd()
 
+def file_crc32(filepath):
+    with open(filepath, "rb") as f:
+        return zlib.crc32(f.read())
+
+# 1. Stage files
 stage_folder = os.path.join(base_dir, "stage")
-stage_files = [f for f in os.listdir(stage_folder) if os.path.isfile(os.path.join(stage_folder, f))]
+stage_files = {
+    f: file_crc32(os.path.join(stage_folder, f))
+    for f in os.listdir(stage_folder)
+    if os.path.isfile(os.path.join(stage_folder, f))
+}
 
 with open("download_manifest.json", "w", encoding="utf-8") as f:
     json.dump(stage_files, f, ensure_ascii=False, indent=2)
 
+# 2. Android audio files (.ogg.zip)
 audio_folder = os.path.join(base_dir, "audio")
-ogg_zip_files = [f for f in os.listdir(audio_folder) if f.endswith(".ogg.zip") and os.path.isfile(os.path.join(audio_folder, f))]
+ogg_zip_files = {
+    f: file_crc32(os.path.join(audio_folder, f))
+    for f in os.listdir(audio_folder)
+    if f.endswith(".ogg.zip") and os.path.isfile(os.path.join(audio_folder, f))
+}
 
 with open("download_manifest_android.json", "w", encoding="utf-8") as f:
     json.dump(ogg_zip_files, f, ensure_ascii=False, indent=2)
 
-m4a_zip_files = [f for f in os.listdir(audio_folder) if f.endswith(".m4a.zip") and os.path.isfile(os.path.join(audio_folder, f))]
+# 3. iOS audio files (.m4a.zip)
+m4a_zip_files = {
+    f: file_crc32(os.path.join(audio_folder, f))
+    for f in os.listdir(audio_folder)
+    if f.endswith(".m4a.zip") and os.path.isfile(os.path.join(audio_folder, f))
+}
 
 with open("download_manifest_ios.json", "w", encoding="utf-8") as f:
     json.dump(m4a_zip_files, f, ensure_ascii=False, indent=2)
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diff --git a/various-tools/batch download lister/readme.txt b/various-tools/batch download lister/readme.txt
index 271b7c6..5728367 100644
--- a/various-tools/batch download lister/readme.txt	
+++ b/various-tools/batch download lister/readme.txt	
@@ -1,3 +1,7 @@
 Since flutter cannot do native zipcrypto and beautifulSoup shenanigans, I opted to pre-compute the list of files that the downloader should take.
 
-Place this script with the `pak` files and run. It will generate 3 json files, one for `common` (stages), one for `android` (ogg), and one for `ios` (m4a). The flutter app will simply query the endpoint and use the list to download.
\ No newline at end of file
+Place this script with the `pak` files and run. It will generate 3 json files, one for `common` (stages), one for `android` (ogg), and one for `ios` (m4a). 
+
+Move these files to api/config.
+
+The flutter app will simply query the endpoint and use the list to download.
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