$user = "cityeyes"
$pass= "ironyun"
$secpasswd = ConvertTo-SecureString $pass -AsPlainText -Force
$credential = New-Object System.Management.Automation.PSCredential($user, $secpasswd)

$url = "http://172.16.15.108/cn/3.1.0-patch/IV_RealtimeVFEngine-patch-3.1.0.20170102.exe"
$output = "patch.exe"

Invoke-WebRequest $url -OutFile $output -Credential $credential