Script for downloading a Powerhell script via a proxy and executing it

download-and-run.ps1

param (
  [Parameter(Mandatory=$true, HelpMessage='Provide a URL to download')]
  $url
)

$proxy = new-object System.Net.WebProxy("http://myproxyaddress")
$username = 'myusername'
$password = ConvertTo-SecureString 'MyPass' -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential $username, $password
$proxy.credentials = $cred
$webClient = new-object System.New.WebClient
$webClient.proxy = $proxy
$webClient.DownloadString($url) | invoke-expression