Support Dataverse files without a persistentID

pooch/downloaders.py

@@ -1034,20 +1034,31 @@
         download_url : str
             The HTTP URL that can be used to download the file.
         """
-
         parsed = parse_url(self.archive_url)
-
-        # Iterate over the given files until we find one of the requested name
-        for filedata in self.api_response.json()["data"]["latestVersion"]["files"]:
-            if file_name == filedata["dataFile"]["filename"]:
-                return (
-                    f"{parsed['protocol']}://{parsed['netloc']}/api/access/datafile/"
-                    f":persistentId?persistentId={filedata['dataFile']['persistentId']}"
-                )
-
-        raise ValueError(
-            f"File '{file_name}' not found in data archive {self.archive_url} (doi:{self.doi})."
-        )
+        response = self.api_response.json()
+        files = {
+            file["dataFile"]["filename"]: file["dataFile"]
+            for file in response["data"]["latestVersion"]["files"]
+        }
+        if file_name not in files:
+            raise ValueError(
+                f"File '{file_name}' not found in data archive "
+                f"{self.archive_url} (doi:{self.doi})."
+            )
+        # Generate download_url using persistentId or file id
+        persistent_id = files[file_name].get("persistentId")
+        if persistent_id:
+            download_url = (
+                f"{parsed['protocol']}://{parsed['netloc']}/api/access/datafile/"
+                f":persistentId?persistentId={persistent_id}"
+            )
+        else:
+            file_id = files[file_name]["id"]
+            download_url = (
+                f"{parsed['protocol']}://{parsed['netloc']}/api/access/datafile/"
+                f"{file_id}"
+            )
+        return download_url
 
     def populate_registry(self, pooch):
         """