Ammar Askar added the comment:

Looks like that error is coming from the fact that the Powershell on that 
buildbot is outdated. As the documentation notes:

https://msdn.microsoft.com/en-us/powershell/reference/5.1/microsoft.powershell.utility/invoke-webrequest

> This cmdlet was introduced in Windows PowerShell 3.0.


Before running the web request command maybe do a `powershell.exe -Command 
$PSVersionTable.PSVersion` in order to debug this issue on any other machines?

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nosy: +ammar2

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<http://bugs.python.org/issue30450>
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