Logitech webcam f=3m65 mm

Hello,

I need help. I lost my cd installer for my logitech webcam f=3.85 mm. I want to install it in my loptop but I cann't find it. Can anybody help me how to install the program (installer) without a cd? Any recommend website that give free program for logitech webcam installer.? Please help. I don't want to buy one as I have already a webcam, needs only the installer for webcam itself so I can use it in my loptop.