gerdaroot/Horizon-Offline-Launcher ? reverse-engineered prompt

Build me a desktop launcher for Horizon so I can play Minecraft Java 26.3 without signing into a Microsoft account.

I want it to start the game offline under my own name, let me pick a 26.3 jar from anywhere on my computer if it cannot find one automatically, and guide me through preparing the resources the first time. It should also let me choose my own skin and cape, update itself from this project’s releases, and keep worlds and settings in the same place as the normal Horizon launcher.

Make it work on Windows, Linux, and macOS, with a proper installer on Windows and a simple install command on the other platforms. If you need to check current docs for anything, look them up online. Keep the experience simple for a regular person, with clear buttons like Prepare, Play, and Choose jar.