$webClient = New-Object System.Net.WebClient 

$Urls = Get-Content url.txt

for ( $i = 1; $i -le $Urls.Length; $i++ ){
  $webClient.DownloadFile($Urls[$i - 1], ($Urls[$i - 1]).Substring(($Urls[$i - 1]).LastIndexOf("/") + 1))
}