Elan touchpad program accidently deleted

I started with Windows 7. I recently upgraded to Windows 10 and, almost immediately, my Elan Touchpad started acting up, e.g., staying active after I had connected a mouse to the system.

I contacted Asus support. I was told to delete the Elan program and install a newer SmartGesture program. I stupidly followed the advice and now I have no way to disable the touchpad---something I desperately want to do. The touchpad is ALWAYS active and I MUCH prefer to use a mouse.

I need a copy of the original Elan program that I stupidly deleted from Programs and Features. Can anyone help? After I did as the Asus techies told me to do and it all went haywire, I let them know and, from that point on, it's been ABSOLUTE SILENCE!

My laptop's serial number is C2N 0AS KRR 07B 07C and my product key (if that's still valid after installing Windows 10) is PXJ2C-T3YWF-BXJQG-KXFW7-3T23T.