Windows 10 Bootcamp Driver Problem

Hello, I just installed Windows 10 by creating a partition with disk utility and then using a USB stick to install windows 10 so I haven't used boot camp to create the partition or to install windows.. Everything seemed fine until windows started, meaning the mouse & keyboard didn't work, I downloaded the drivers from bootcamp and installed them on the windows partition but still nothing is working.

I updated OSX Lion to El Capitan to get bootcamp 6 and get the windows 10 drivers but still, nothing is working. Something I've noticed is that on the windows partition when I click on the info for bootcamp it says Version 5.1 but I'm sure I've downloaded the drivers from Bootcamp 6.

After I downloaded the bootcamp 6 drivers I downgraded back to Lion because El Capitan was too problematic, so I can't even download the drivers again, is there a way to download them directly? Iv'e seen a way with Brigadier on some posts but I don't understand how it works.

Do the drivers from bootcamp work even if I didn't use bootcamp to install windows or create the partition with it?

Please help me!

I have an iMac 21,5" late 2012