Get-WebFile.ps1

[CmdletBinding()]
param(
    [Parameter(Mandatory=$true)][string]$url,
    [Parameter()][string]$dest='.\',
    [Parameter()][switch]$UseBITS=$false
    )

$start = Get-Date

if($dest.Substring($dest.Length-1, 1) -ne '\') { $dest +='\' }
if(!(Test-Path $dest)) { New-Item $dest -type directory -Force }


$file = [System.IO.Path]::GetFilename([System.Net.WebUtility]::UrlDecode($url)).Replace('&','&')
if(!(Test-Path -LiteralPath $dest$file)) {
    Write-Host "Getting $file"
    if($UseBITS) {
        Import-Module BitsTransfer
        Start-BitsTransfer -Source $url -Destination $dest$file
    } else {
        Invoke-WebRequest $url -outfile $dest$file -ErrorAction SilentlyContinue
    }
}

[gc]::collect()
$end = Get-Date
$elapsed = $end - $start

Write-Host "Done! $elapsed" -ForegroundColor Green