Maybe HP has discontinued support for the M260 (unlikely as of 2025, but possible). Here are two alternatives:
Record complex key combinations with precise delay timings for MMO or FPS advantages. Troubleshooting Common Driver Issues hp gaming mouse m260 driver full
Once the installation completes, check the box that says "Launch Program" and click . Maybe HP has discontinued support for the M260
Toggle between 800 and 6,400 DPI using the on-mouse switch to match your gameplay speed. hp gaming mouse m260 driver full