urlpatterns = [
    url(r'^f/', include('django_file_download.urls', namespace='django_file_download')),
]

from django.conf.urls import include, url
from django_file_download import views as file_views

urlpatterns = [
    url(r'^download$', file_views.file_download, name='file_download'),
]

INSTALLED_APPS = (
    ...
    'django_file_download',
    ...
)