diff --git a/DeepFilterNet/df/io.py b/DeepFilterNet/df/io.py
index 58024b152..2c0c0f805 100644
--- a/DeepFilterNet/df/io.py
+++ b/DeepFilterNet/df/io.py
@@ -118,12 +118,14 @@ def resample(audio: Tensor, orig_sr: int, new_sr: int, method="sinc_fast"):
 
 def get_test_sample(sr: int = 48000) -> Tensor:
     dir = get_git_root()
-    file_path = os.path.join("assets", "clean_freesound_33711.wav")
+    rel_path = ("assets", "clean_freesound_33711.wav")
     if dir is None:
-        url = "https://github.com/Rikorose/DeepFilterNet/raw/main/" + file_path
+        # Join with "/" rather than os.path.join: on Windows the latter yields
+        # ".../raw/main/assets\clean_freesound_33711.wav", which 404s.
+        url = "https://github.com/Rikorose/DeepFilterNet/raw/main/" + "/".join(rel_path)
         save_dir = get_cache_dir()
         path = download_file(url, save_dir)
     else:
-        path = os.path.join(dir, file_path)
+        path = os.path.join(dir, *rel_path)
     sample, _ = load_audio(path, sr=sr)
     return sample
diff --git a/DeepFilterNet/df/scripts/export.py b/DeepFilterNet/df/scripts/export.py
index ea5afd752..19d23394e 100644
--- a/DeepFilterNet/df/scripts/export.py
+++ b/DeepFilterNet/df/scripts/export.py
@@ -330,11 +330,13 @@ def main(args):
         f.write(f"{model_name}_epoch_{epoch}")
     tar_name = export_dir / (Path(model_base_dir).name + "_onnx.tar.gz")
     with tarfile.open(tar_name, mode="w:gz") as f:
-        f.add(os.path.join(args.export_dir, "enc.onnx"))
-        f.add(os.path.join(args.export_dir, "erb_dec.onnx"))
-        f.add(os.path.join(args.export_dir, "df_dec.onnx"))
-        f.add(os.path.join(args.export_dir, "config.ini"))
-        f.add(os.path.join(args.export_dir, "version.txt"))
+        for name in ("enc.onnx", "erb_dec.onnx", "df_dec.onnx", "config.ini", "version.txt"):
+            # arcname, so the archive holds bare filenames. Without it every
+            # entry carries the exporter's own export_dir — "tmp/foo/enc.onnx",
+            # or on Windows "Users/<name>/AppData/Local/Temp/.../enc.onnx" —
+            # which recreates that tree on extraction and puts the builder's
+            # username in the released artefact.
+            f.add(os.path.join(args.export_dir, name), arcname=name)
 
 
 if __name__ == "__main__":
diff --git a/DeepFilterNet/df/utils.py b/DeepFilterNet/df/utils.py
index cea7a9b3e..7b123ef12 100644
--- a/DeepFilterNet/df/utils.py
+++ b/DeepFilterNet/df/utils.py
@@ -210,6 +210,10 @@ def download_file(url: str, download_dir: str, extract: bool = False):
     import requests
 
     local_filename = url.split("/")[-1]
+    # get_cache_dir() names a directory but does not create it, so on a machine
+    # that has not downloaded anything before, the open() below raises
+    # FileNotFoundError instead of downloading.
+    os.makedirs(download_dir, exist_ok=True)
     local_filename = os.path.join(download_dir, local_filename)
     with requests.get(url, stream=True) as r:
         if r.status_code >= 400: