Symptom: Installation fails halfway saying "Missing file." Solution: Your Windows Installer service is corrupted or your antivirus blocked the extraction.
Download the latest firmware updater directly from HP’s website. Run it with the mouse plugged in and no other USB devices connected. If it still fails, contact HP Support—some early M260 units had a buggy firmware flashing process. hp gaming mouse m260 driver
This is where the confusion starts. You can’t change the DPI or RGB via a software suite (like Logitech G Hub or Razer Synapse). The HP M260 uses on-the-fly hardware buttons. Symptom: Installation fails halfway saying "Missing file
Here is how to control your mouse without any driver: hp gaming mouse m260 driver