title: Cannot install pytorch in a virtualenv on windows
body: <p>I know there are a few topics about that on this website but still, I can't find the solution.</p>
  
  <p>So here is what I did : 
  I created a projecton Visual Studio 19 for python.
  I added an virtual environment with Python 3.7 using the file requirements.txt</p>
  
  <p>It contains</p>
  
  <pre><code>mypy==0.750
  pylint==2.4.4
  pytest==5.3.1
  matplotlib==3.1.1
  torch==1.3.1
  tensorflow==2.1.0rc0
  </code></pre>
  
  <p>This requirement file works perfectly well on linux. But on vs19 I get the following : </p>
  
  <pre><code>ERROR: Could not find a version that satisfies the requirement torch==1.3.1 (from -r E:\Documents\Blub\Granolar\requirements.txt (line 5)) (from versions: 0.1.2, 0.1.2.post1, 0.1.2.post2)`
  </code></pre>
  
  <p>Since I don't want to downgrade to 0.1.2 (obviously) how can I fix it?</p>