MegaMaximus

When I installed my ASUS Prime z370-a and new CPU I had to reactivate my windows. I went to go find my super old windows 8.1 (even though i had windows 10 at the time) disk and found an activation code in the back of the package, typed it in and then the activate windows watermark went away. 

I'm not sure what connections your rgb controller has. To connect to your power supply directly, it usually uses sata or molex, which i can't tell from the pictures.
Either way, i recommend connecting to the motherboard, so you can take advantage of various RGB software & control it from your computer. If you plug it into the power supply only, then you can only control it with the built-in settings on the rgb controller

That case doesn't have a PSU connector it has to be controlled by an RGB controller/header on a compatible motherboard and OPs motherboard came out long before RGB headers. OP will have to upgrade their system or buy a different case that uses an internal hub and an IR controller and not an RGB header.

@MegaMaximus Your motherboard and components are way to old to use any sort of RGB header, that case needs a newer motherboard with an rgb controller on it to work. If you want that case to work you will have to upgrade to a newer CPU, Motherboard, and Ram combo.