Make sure to first have SuperBLT, and BeardLib installed. Click the links in the dependency list.

Optional video tutorial for installing SuperBLT, BeardLib, and mod_overrides mods: https://youtu.be/rin_sjSJIkg

1. After downloading the mod, use a program such as 7zip or WinRAR to extract the folder in the mod.
2. Navigate to your steam directory. The assets folder is supposed to be in your game's installation folder (don't know where that is? click here).
3. Move the folder of the mod from step 1 to the folder you navigated to in step 2. Let the folders merge.