Remove assert in DownloadManager.download function

Author: avnermay

src/together/filemanager.py

@@ -213,7 +213,8 @@ def download(
                 if not fetch_metadata:
                     file_size = int(response.headers.get("content-length", 0))
 
-                assert file_size != 0, "Unable to retrieve remote file."
+                # TODO: We are commenting this out while we figure out why we get file_size == 0.
+                # assert file_size != 0, "Unable to retrieve remote file."
 
                 with tqdm(
                     total=file_size,