[CmdletBinding()]

param(
    [Parameter(Mandatory=$true, HelpMessage='URL of to download')]
    [ValidateNotNullOrEmpty()]
    [string]
    $url,
    [Parameter(Mandatory=$true, HelpMessage='Save to filename')]
    [ValidateNotNullOrEmpty()]
    [string]
    $saveAsFilename)

$toFilename = "$PSScriptRoot\$saveAsFilename"

Write-Output "Downloading '$url' to '$toFilename'..."

Invoke-WebRequest -uri $url -outfile $toFilename

Write-Output "Downloaded."