If your problem sounds like this, you're in the right place:

  • VAN9004. This version of Vanguard requires you to update your operating system to Windows 10 20H1 or newer. See the Vanguard notification center in the tray for more details.
  • What does VAN 9004 mean?
  • Vanguard says I need to update Windows.

Resolution

VAN 9004 means Vanguard currently requires Windows 10 20H1 or newer, but doesn't detect that version of Windows on your PC.

Windows updates can include security and system service changes Vanguard relies on, so install all available Windows updates, restart your PC, then try launching your game again.