message: FFmpeg: try to download wrapper with elevated privileges
diff: @@ -12,6 +12,22 @@ Write-Output ("=" * 120)
  Write-Output ""
  if(![System.IO.File]::Exists($output)) {
  + try {
  + [io.file]::OpenWrite($output).close()
  + } catch {
  + Write-Warning "Unable to write: $output"
  + if (!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
  + Write-Warning "Launching with 'Administrator' elevated privileges..."
  + Pause
  + Start-Process powershell.exe "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs
  + exit
  + } else {
  + Write-Output "FATAL: Unable to write with elevated privileges: $output"
  + Pause
  + exit 1
  + }
  + }
  +
  try {
  Write-Output ("Downloading: " + $output)
  Import-Module BitsTransfer
  