Web Platform Installer: Python Installer - Downloaded file failed signature verification and may have been tampered with

Question

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.

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".

I noticed that the direct download link in the prerequisites tab launches this URL, which explains that pytools has been migrated to PTVS. Maybe this is part of the problem?

I'm following this tutorial 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!

Answer 1

I had the exact same issue, and as mgrollins mentioned on his comment, using wfastcgi directly is the solution.

In my case I followed a very similar tutorial (here) up to where you finish installing IIS, then instead of installing the Web Platform Installer, I downloaded Python from python.org, installed it (for all users and adding to PATH), performed the "Downloading Package" and "Enabling wfastcgi" steps from the wfastcgi project page, https://pypi.org/project/wfastcgi/, meaning:

pip install wfastcgi 

wfastcgi-enable

After that you can continue following the tutorial from where it says "Setup your site - copy the wfastcgi.py " . (I found the wfastcgi.py file on the Scripts folder of the Python Install directory)

Another item worth mentioning, during “Add Module Mapping” there should be a | between the Python.exe and your site directory, if you miss it the side won't load, so for example it should look like:

C:\Program Files\Python36\python.exe|C:\inetpub\wwwroot\mysite\wfastcgi.py