It is reported that Install-Module or Update-Module sometimes fails on some machines. Based on our investigation, it is something to do with the networking connection. Recently we updated NuGet provider so that it can reliably download packages. You can follow the instructions below to install the latest build of NuGet provider and then install or update your module. Let's use 'Azure' module as an example below.
Install-PackageProvider NuGet -MinimumVersion 188.8.131.52 -Force Launch new PowerShell Console Update-Module Azure -Verbose