download.ps1

param([String]$url, [String]$path="")

# It is a poor man's cURL, but can be used to download cURL
# powershell -file download.ps1 -url https://dl.uxnr.de/build/curl/curl_winssl_cross_x64/curl-7.50.3/curl-7.50.3.zip
# powershell -file download.ps1 -url https://cdn.rawgit.com/martinrotter/7za/master/7za.exe
# NOTE: may require "Set-ExecutionPolicy RemoteSigned"

if ($path -eq "") {
    $path = [System.IO.Path]::GetFileName($url)
}

if (test-path $path) {
    write-host -fore yellow "Already exists: $path"
} else {
    write-host -fore green "Downloading: $url"
    $client = new-object Net.WebClient
    $proxy = [System.Net.WebRequest]::DefaultWebProxy
    $proxy.Credentials = [System.Net.CredentialCache]::DefaultCredentials
    $client.Proxy = $proxy
    $client.DownloadFile($url, $path)
    write-host -fore green "Saved as: $path"
}