A quick update...

download_tags.py

from django import template
from cms_downloads.models import FileRevisions
import os

register = template.Library()

def get_latest_download_by_name(file_name):
    download_query = FileRevisions.objects.filter(name__name__startswith=filename).order_by('-version')[0]
    if download_query.count == 0: download_query = None
    return {'cms_download': download_query}

register.inclusion_tag('cms_downloads/single-download.html')(get_download_from_name)