Pip reports that Django 1.9.x is not supported

[NazarTopolsky]

While installing django-registration for my project that still uses Django 1.9, I have encountered a peculiar error. If I explicitly specify Django and django-registration versions like this:

pip install django-registration==2.4.1 django==1.9.13

everything goes smoothly.

However, if I install django-registration first, and then downgrade to Django 1.9, I get the following output:

Collecting Django==1.9.13
  Using cached https://files.pythonhosted.org/packages/a6/ee/6dfd9e8e0d61ab22ed09c6c8f6ae5a4ad0d3bf07bca9124fb5a087f876df/Django-1.9.13-py2.py3-none-any.whl
 django-registration 2.4.1 has requirement Django!=1.9.*,<2.0,>=1.8, but you'll have django 1.9.13 which is incompatible.
  Installing collected packages: Django
    Found existing installation: Django 1.11.14
      Uninstalling Django-1.11.14:
        Successfully uninstalled Django-1.11.14
Successfully installed Django-1.9.13

Documentation states that Django 1.9 is supported:

The 2.4.1 release of django-registration supports Django 1.8, 1.9, 1.10 and 1.11, on the following Python versions:

I tend to trust documentation over pip output, and the code seems to work, but it is strange.

[ubernostrum]

It's an error in the documentation. Django 1.9 is not supported; django-registration only officially supports upstream-supported versions of Django, and at the time of the 2.4.1 release Django 1.9 was past end-of-life.