K95 RGB How do i install the software?

This is going to sound outrageous but I cant manage to install the software for my K95 RGB for some reason.



I download the software and when I try to open it windows asks me what program I want to use to open it and says .77[1] is an unknown file type so its taking part of the file title as the file type.



I guess I am downloading the wrong thing or something?





Thanks