Make sure to first have SuperBLT installed. Click the link 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 main folder of the mod.
2. Drop that folder into the mods folder which is supposed to be in the game's installation folder (don't know where that is? click here)

BeardLib is completely optional, and is only used to solve a single edge-case issue that is so rare I'm not sure if it still exists, or if it actually ever did.
Oh, and BeardLib is also used for auto-updates.