diff --git a/biobricks/downloader.py b/biobricks/downloader.py
index c39cb5a..1af89c1 100644
--- a/biobricks/downloader.py
+++ b/biobricks/downloader.py
@@ -7,6 +7,15 @@
 from pathlib import Path
 from tqdm import tqdm  # Import tqdm for the progress bar
 
+from dataclasses import dataclass, field
+
+@dataclass
+class Downloader:
+    remote_url_prefix: str = field(default = 'https://dvc.biobricks.ai/files/md5/')
+
+    def _md5_to_remote_url( self, md5 ):
+        return self.remote_url_prefix + md5[:2] + "/" + md5[2:]
+
 def _download_outdir(url, dest_path: Path):
     with requests.get(url, headers={'BBToken': token()}, stream=True) as r:
         r.raise_for_status()