def process_tree_files(tree):
    """ process_tree_files: Download files from nodes
        Args:
            tree (ChannelManager): manager to handle communication to Kolibri Studio
        Returns: None
    """
    # Fill in values necessary for next steps
    config.LOGGER.info("Processing content...")
    files_to_diff = tree.process_tree(tree.channel)
    config.SUSHI_BAR_CLIENT.report_statistics(files_to_diff, topic_count=tree.channel.get_topic_count())
    tree.check_for_files_failed()
    return files_to_diff, config.FAILED_FILES
process_tree_files: Download files from nodes
        Args:
            tree (ChannelManager): manager to handle communication to Kolibri Studio
        Returns: None