title: pip doesn't work after upgrade on Python 3.4 (Windows 10). How to downgrade?
body: <p>I upgraded pip on Python 3.4 to last version (20.1.1) and new pip doesn't work with message</p>
  
  <pre><code>RuntimeError: Python 3.5 or later is required
  </code></pre>
  
  <p>How to return back old version of pip?</p>
  
  <p>I can't upgrade Python to 3.5 version or more </p>
  
  <p>I can't use a new pip to install old version - my new pip doesn't work at all</p>
  
  <p>Is there any way to uninstall pip?</p>