ERROR 422

https://rylestolz.com/error-422-2/

# ERROR 422 custom installation

Files: `ERROR422Setup.exe` (setup/update) sits next to the `Set up Folders` folder, which holds `java422.exe` (launcher wrapper), `ERROR422.exe` (your game), and the sources. Keep them together.

1. Open the Official Minecraft Launcher once (so its data exists), then run `ERROR422Setup.exe`.

2. Click **Install/Update**. It asks for permission (if the Minecraft Launcher is open, it is closed and reopened automatically), and if 32-bit Java is missing, it offers to download a portable Eclipse Temurin 17 (x86) into the ERROR 422 folder using cmd (curl/tar). No administrator rights are needed. This copies the files to `%APPDATA%\.minecraft\error422\` and adds one new “ERROR 422” installation. Other installations are untouched; a backup is saved as `launcher_profiles.json.error422.bak`.

3. Choose **ERROR 422**, and press Play: a glitch sound plays and `ERROR422.exe` opens instead of Minecraft.

4. If you replace `ERROR422.exe`/`java422.exe`, run setup again; run **Install/Update** again to push the changes (it hashes the payload files, and running exes can’t be overwritten, so close the game first).

Build (from a VS x64 developer prompt, in this folder): `cl /EHsc /std:c++17 /O2 /DUNICODE /D_UNICODE java422.cpp /link /SUBSYSTEM: WINDOWS user32.lib gdi32.lib winmm.lib gdiplus.lib ole32.lib advapi32.lib` and `cl /EHsc /std:c++17 /O2 /DUNICODE /D_UNICODE ERROR422Setup.cpp /link /SUBSYSTEM: WINDOWS` (add any libs the linker reports missing, e.g. user32.lib gdi32.lib).

## Multiplayer (patched game)

– **Multiplayer button** on the title screen is real again (server list, Direct Connect, LAN worlds are discovered automatically).

– **Open to LAN** in the pause menu is real again: open a single-player world, press Esc, **Open to LAN**, **Start LAN World**. Friends on your network pick it from the Multiplayer list (or Direct Connect to the port shown in chat). To play over the internet, forward that port on your router.