title: AttributeError: type object 'SettingsFrame' has no attribute 'ENABLE_CONNECT_PROTOCOL'
body: <p>I am on windows - anaconda environment, and I have just updated scrapy 2.4.1 to the latest version 2.5.1, but I am receiving the following error when using any scrapy commands.</p>
  <pre><code>Traceback (most recent call last):
    File &quot;C:\Users\Data\Anaconda3\Scripts\scrapy-script.py&quot;, line 6, in &lt;module&gt;
      from scrapy.cmdline import execute
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\scrapy\__init__.py&quot;, line 12, in &lt;module&gt;
      from scrapy.spiders import Spider
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\scrapy\spiders\__init__.py&quot;, line 11, in &lt;module&gt;
      from scrapy.http import Request
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\scrapy\http\__init__.py&quot;, line 11, in &lt;module&gt;
      from scrapy.http.request.form import FormRequest
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\scrapy\http\request\form.py&quot;, line 16, in &lt;module&gt;
      from scrapy.utils.response import get_base_url
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\scrapy\utils\response.py&quot;, line 14, in &lt;module&gt;
      from twisted.web import http
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\twisted\web\http.py&quot;, line 183, in &lt;module&gt;
      from twisted.web._http2 import H2Connection
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\twisted\web\_http2.py&quot;, line 27, in &lt;module&gt;
      import h2.connection
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\h2\connection.py&quot;, line 23, in &lt;module&gt;
      from .events import (
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\h2\events.py&quot;, line 14, in &lt;module&gt;
      from .settings import ChangedSetting, _setting_code_from_int
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\h2\settings.py&quot;, line 25, in &lt;module&gt;
      class SettingCodes(enum.IntEnum):
    File &quot;C:\Users\Data\Anaconda3\lib\site-packages\h2\settings.py&quot;, line 60, in SettingCodes
      ENABLE_CONNECT_PROTOCOL = SettingsFrame.ENABLE_CONNECT_PROTOCOL
  AttributeError: type object 'SettingsFrame' has no attribute 'ENABLE_CONNECT_PROTOCOL'
  </code></pre>
  <p>I attempted to update the h2 package by &quot;conda install -c conda-forge h2&quot;, however all requested packages are already installed. Would appreciate any help!</p>