If you are trying to "develop" or add features to this specific build:
: Extract the .zip contents to a folder. This version is often used for stability in long-running modded playthroughs before the jump to version 1.5.
: A library almost every feature mod uses to "patch" or modify existing game methods at runtime. Recommended QoL Features for 1.4
: A performance mod essential for maintaining high TPS (Ticks Per Second) in the late game.
: A highly recommended Mod Manager to handle load orders and dependencies without launching the game.
: Massive content additions that feel like official DLC.