Update app.py

app.py

@@ -294,10 +294,12 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
 
         def on_submit(llm, file, relevance, diversity):
             message, output_file = process_inputs(llm, file, relevance, diversity)
-            return message, output_file
-
-        submit_button.click(fn=on_submit, inputs=[llm_dropdown, file_upload, relevance_slider, diversity_slider], outputs=[None, download_button], postprocess=update_download_button)
+            if output_file:
+                return message, gr.File.update(value=output_file, visible=True)
+            else:
+                return message, gr.File.update(visible=False)
 
+        submit_button.click(fn=on_submit, inputs=[llm_dropdown, file_upload, relevance_slider, diversity_slider], outputs=[None, download_button])
             
 # Launch the Gradio app
 demo.launch()