x86 version that can use gamecube controller

[mark.l]

I am currently using version 4.0.2 because it is one of the few versions of dolphin that has an x86 download. Today i bought a gamecube controller adapter to use for dolphin. When reading online I found out that only the newer versions of dolphin are able to have a gamecube controller connected. I checked out some youtube videos for help and how to get the controller working in dolphin. when they open dolpin you can see a button for 'controller' my version shows GCpad and Wiimote instead. So I cant find the auto connect button for the gamecube adapter (is there even is one) which is found when the 'controller' button is clicked.
Is there a newer version of dolphin that is available for x86, or is there a different way to get my controller working on my current version?

Thanks!