Getting StartedStart here

Installation

Install the right InputBooster jar for your loader and Minecraft version, verify it loaded, and find the files it writes.

2 min readInputBooster 4.1.2-alphaMinecraft 26.2 / 26.3

Installation is one jar in one folder. The only real decision is which jar: pick the one whose mc262 or mc263 suffix matches your Minecraft version and your loader.

Before you start

Requirements — confirm Java 25 and your loader version.
Jar matrix — the full table of published jars and their version ranges.

Match the mc262 or mc263 suffix to your Minecraft version and the loader name to your loader. Never install two InputBooster jars at once — both register the same key mappings and the same mixins, and the client will crash during class transformation.

Copy it into the mods folder

The folder is the mods directory inside your Minecraft installation. On the official launcher it is the one with the versions folder next to it.

Start the client

Launch Minecraft. The mod is client only, so join a world to test it; the settings button is on the options screen, not in a server list.

Check the log

Look for the ready line. If it is missing, the mod did not load.

Fabric

Fabric needs three things in mods: the InputBooster jar, Fabric API, and any other mods you use.

Fabric 26.3

$ .minecraft/mods/inputbooster-4.1.2-alpha-fabric-mc263.jar

Fabric 26.2

$ .minecraft/mods/inputbooster-4.1.2-alpha-fabric-mc262.jar

NeoForge

NeoForge has no separate API jar. The mod goes in the same mods folder.

NeoForge 26.2

$ .minecraft/mods/inputbooster-4.1.2-alpha-nf-mc262.jar

Verify it loaded

The mod prints a ready line during initialisation. Open the log file and look for it:

The log the mod writes to

$ .minecraft/logs/latest.log

text

[InputBooster] Starting v4.1.2-alpha
[Mixin] All client hooks present.
[Mixin] Screen hooks: setScreenAndShow=true, setScreen=false
[inputbooster-config] Loading config from .../config/inputbooster.properties
[inputbooster-config] ✓ Config loaded successfully (config version 305)
[Input] Polling thread started at 200 Hz.
[InputBooster] Ready!

If you see Ready!, the engine, the poller and the mixins are all live. The lines above it tell you which optional parts applied; the log reference explains each one.

Where the mod writes

Everything lives next to the game, in the config folder:

Files InputBooster creates

.minecraft/

config/

inputbooster_profiles.json

inputbooster_server_profiles.properties

inputbooster.properties

The inputbooster.properties file is created on the first launch with every default in it. The two other files only appear when you use profiles.

Removing it

Delete the jar. The config files stay where they are, so a reinstall picks up your old settings. Delete config/inputbooster.properties as well if you want a clean start; the mod recreates it with defaults on the next launch.

First session — open the settings and confirm the engine is doing what you expect.
Updating — moving between versions without losing your settings.
Client only — what the mod sends to a server, and what it does not.