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$tfsBaseUrl = "http://tfsserver:8080/tfs/P2U"
$feedName = "Libraries"

$feeds = Invoke-RestMethod "$tfsBaseUrl/_apis/Packaging/Feeds" -UseDefaultCredentials
$feed = $feeds.value | Where-Object { $_.name -eq $feedName }

$packageBaseUri = "$tfsBaseUrl/_packaging/$($feed.id)/nuget/v3/flat2"
$packages = $(Invoke-RestMethod "$($feed.url)/Packages" -UseDefaultCredentials)

foreach ($package in $packages.value) 
{
    foreach ($version in $package.versions.version)
    {
        $packageUri = "$packageBaseUri/$($package.name)/$version/$($package.name).$version.nupkg"
        $outFile = "$($package.name).$($version).nupkg"

        Write-Host "Package URL: $packageUri"
        Write-Host "OutFile: $outFile"

        Invoke-WebRequest $packageUri -UseDefaultCredentials -OutFile "$($package.name).$($version).nupkg"
    }    
}