How do I download the mod and where do I put it to work?
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Sorry for the late response!
You can read how to install mods here.
TL;DR
After downloading it, you'll need to head to your Nuclear Throne folder.
Then drag and drop the folder inside the file you downloaded into your mods folder.
You need to have Nuclear Throne Together installed for this to work.
When the mod is installed, all you need to do is type '/load knight' in-game.
Have fun! :)