title: Web Platform Installer: Python Installer - Downloaded file failed signature verification and may have been tampered with
body: <p>I'm trying to install WFastCGI 2.1 Gateway for IIS and Python 3.4 via the Web Platform Installer in Microsoft Server Manager's IIS Manager.</p>
  
  <p>Python Installer fails with the error: "This product did not install successfully: Downloaded file failed signature verification and may have been tampered with". Python 3.4.2 (32-bit) and WFastCGI 2.1 Gateway for IIS and Python 3.4 subsequently fail with the error: "This product cannot be installed because a product that it depends on did not install successfully".</p>
  
  <p>I noticed that the direct download link in the prerequisites tab launches <a href="https://archive.codeplex.com/?p=pytools" rel="nofollow noreferrer">this URL</a>, which explains that pytools has been migrated to PTVS. Maybe this is part of the problem? </p>
  
  <p>I'm following <a href="http://netdot.co/2015/03/09/flask-on-iis/" rel="nofollow noreferrer">this tutorial</a> about deploying a Flask web app on IIS. Please help me find solutions to make this installation successful or provide alternatives that will allow me to deploy on IIS. Thank you!</p>