Reason: Some older XPrinter drivers are not digitally signed for the latest Windows. Method: Restart PC → Press F8 or Shift + Restart → Troubleshoot → Advanced Options → Startup Settings → Restart → Press 7 (Disable driver signature enforcement). Then install the driver.

Downloading the file is only 10% of the battle. You must disable a specific Windows feature temporarily to install unsigned legacy drivers. Here is the foolproof method for Windows 11/10.