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Improved Cleanroom Relauncher

Improved Cleanroom Relauncher

Improves upon the original Cleanroom Relauncher by automating the first time setup and configuration while also making it more modpack friendly

120
0

Compatibility

Minecraft: Java Edition

1.12.2

Platforms

Supported environments

Client-side
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Links

View source

Creators

Bruv Network Organization

Details

Licensed MIT
Published last month
Updated last week

!improved-relauncher-0.3.5.jar

on Oct 9, 2025
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Hotfix 2: Electric Boogaloo

Fixed

  • MacOS Architecture Detection Again

(Screw Rosetta man, that thing is just too aggressive, also due to Mojang's laziness)

!improved-relauncher-0.3.4.jar

on Oct 8, 2025
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Hotfix

Added

  • Architecture Validation (If your configured architecture and system architecture differ, it will auto download the correct java architecture. This was mainly added to easily fix the previous issue)

!improved-relauncher-0.3.3.jar

on Oct 8, 2025
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Fixed

  • MacOS Architecture Detection

(Delete config to download the correct version, or set javaPath setting to: "Null")

Upstream Changes

Added

  • Respect the launcher's original heap space setting arguments (-Xms, -Xmx) if none is specified in the configuration

Fixed

  • Compatibility with newer MMC pack formats (starting from Cleanroom 0.3.19)
  • Encode and decode configuration with UTF-8
  • Some Linux installs not being detected properly (updated JavaUtils to 1.1.3)

Changed

  • Thanks to @ZZZank, using MethodHandles to call the wrapper class's main method instead of standard reflection, allows for a cleaner stacktrace

!improved-relauncher-0.3.2.jar

on Oct 4, 2025
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TLDR:

Faster more reliable downloads, auto-update, and auto-cleanup.

Added

  • Multi-chunk parallel Java downloads
  • Multi-file parallel library downloads
  • Better download speed and ETA tracking for all downloads
  • Better download resuming and retrying
  • Java download verification
  • Auto-Update
  • Automatic cleanup of unused temp setup files
  • Taskbar icon during download

Fixed

  • Library progress not showing

Changed

  • Default Java version from 21 to 24

!improved-relauncher-0.3.1.jar

on Sep 16, 2025
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Added:

  • GraalVM support (Switch in config)
  • Partial Download Resuming
  • Automatic Download Retry on Fail
  • Download Speed and ETA display
  • Dark Mode (Togglable in config)

Run the game once to generate the updated config

!improved-relauncher-0.3.0.jar

on Aug 28, 2025
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  • Added auto Java download and configuration.
  • Added OS and architecture detection.
  • Windows/Linux/MacOS Support.
  • ARM64/X64 Support.
  • Auto selects latest Cleanroom Loader version and Java 21 on first launch, can be changed in config.
  • Automatically switches Java when Java version changed in config.
  • Download progress popup.
  • Manual selection window now only appears when either detection or download fails.