website-v2/templates/libraries/includes/version_alert.html

{% if version_alert %}
    <div role="alert">
        <p>This is an older version and was released in {{ version.release_date|date:"Y"}}.
           The current version is
            {% if latest_library_version %}
                <a href="{% url 'library-detail' slug=latest_library_version.library.slug %}">
            {% else %}
                <a href="{% url 'version-detail' latest_version.slug %}">
            {% endif %}
            {{ latest_version.display_name }}</a>.
        </p>
    </div>
{% endif %}