Error when installing PowerShellGet Module from PowerShell Gallery

When you run the PowerShell command

Save-Module -Name PowerShellGet -Path <path>

as described in the PowerShell Gallery, you might get the following error messages if you are behind a proxy server that requires authentication.

PS C:\> Save-Module -Name PowerShellGet -Path c:\windows\temp

WARNING: Unable to download the list of available providers. Check your internet connection.
PackageManagement\Install-PackageProvider : No match was found for the specified search criteria for the provider ‘NuGet’. The package provider requires ‘PackageManagement’ and ‘Provider’ tags. Please check if the specified package has the tags.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:5921 char:21
+ … $null = PackageManagement\Install-PackageProvider -Name $script:N …
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (Microsoft.Power…PackageProvider:InstallPackageProvider) [Install-PackageProvider], Exception
+ FullyQualifiedErrorId : NoMatchFoundForProvider,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackageProvider

PackageManagement\Import-PackageProvider : No match was found for the specified search criteria and provider name ‘NuGet’. Try ‘Get-PackageProvider -ListAvailable’ to see if the provider exists on the system.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:5927 char:21
+ … $null = PackageManagement\Import-PackageProvider -Name $script:Nu …
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidData: (NuGet:String) [Import-PackageProvider], Exception
+ FullyQualifiedErrorId : NoMatchFoundForCriteria,Microsoft.PowerShell.PackageManagement.Cmdlets.ImportPackageProvider

WARNING: Unable to download the list of available providers. Check your internet connection.
PackageManagement\Get-PackageProvider : Unable to find package provider ‘NuGet’. It may not be imported yet. Try ‘Get-PackageProvider -ListAvailable’.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:5931 char:30
+ … tProvider = PackageManagement\Get-PackageProvider -Name $script:NuGet …
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (Microsoft.Power…PackageProvider:GetPackageProvider) [Get-PackageProvider], Exception
+ FullyQualifiedErrorId : UnknownProviderFromActivatedList,Microsoft.PowerShell.PackageManagement.Cmdlets.GetPackageProvider

Save-Module : NuGet provider is required to interact with NuGet-based repositories. Please ensure that ‘2.8.5.201’ or newer version of NuGet provider is installed.
At line:1 char:1
+ Save-Module -Name PowerShellGet -Path c:\windows\temp
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [Save-Module], InvalidOperationException
+ FullyQualifiedErrorId : CouldNotInstallNuGetProvider,Save-Module

Possible Solution

You first need to authenticate to the proxy using the following command

[System.Net.WebRequest]::DefaultWebProxy.Credentials = [System.Net.CredentialCache]::DefaultCredentials

or as described in the thread:

$wc = New-Object System.Net.WebClient
$wc.Proxy.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials
$wc.Proxy.Address = "http://proxyurl"

Or, if that does not help, according to this thread:

[system.net.webrequest]::defaultwebproxy = new-object system.net.webproxy('http://YourProxyHostNameGoesHere:ProxyPortGoesHere')

[system.net.webrequest]::defaultwebproxy.credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials

[system.net.webrequest]::defaultwebproxy.BypassProxyOnLocal = $true

Register-PSRepository -Default

Afterwards you need to register the PowerShell repository

Register-PSRepository -Name “PSGallery” -SourceLocation “https://www.powershellgallery.com/api/v2/" -InstallationPolicy Trusted

Now you can re-try installing the module.

HTH