Unlucky-Launcher/packaging/release-notes.md

Unlucky Launcher {{VERSION}}

Rust-native single-file Minecraft launcher: iced 0.14 + Material 3 Expressive UI, built-in AI agent (chat / setting edits / crash diagnosis) and an MCP server other agent tools can attach to. No WebView, no bundled runtime, no JRE download needed to start the launcher itself.

Downloads

Asset names are <name>_<version>_<platform>_<arch>, underscore separated — the rule packaging/make_artifacts.py::asset_stem() applies:

Platform	Asset	Notes
Windows 10/11 x64	unlucky-launcher_{{VERSION}}_windows_x64.exe	single exe, double-click to run
Windows 11 ARM64	unlucky-launcher_{{VERSION}}_windows_arm64.exe	single exe, runs natively on ARM64 Windows

This release ships Windows only. The Linux (x64 / arm64) and macOS (Apple Silicon / Intel) slots are built by CI but are not assets of this release: they have not been verified on real machines yet, so nothing unverified is handed out. They stay out of the download list and out of SHA256SUMS.txt until that verification happens — the support matrix below marks them accordingly.

The Windows assets are bare .exe files, so LICENSE, NOTICE and README.md are attached to this release next to them: the license terms travel with every download. Slots that ship an archive (Linux / macOS, once published) unpack to one top-level directory of the same name holding the binary plus those three documents.

Command line

Each published slot also ships the command line as its own small bare asset, ull_{{VERSION}}_<platform>_<arch> (.exe on Windows):

.\ull_{{VERSION}}_windows_x64.exe instances list   # servers and CI: no graphics stack needed

ull runs instances, install, pack import, launch, accounts, sessions, logs, diag, config, java and agent, and links no graphics library at all. The GUI binary accepts the same set before it ever opens a window, so a desktop machine does not need ull.

Support matrix

Published = shipped as a download of this release, listed in SHA256SUMS.txt.

Platform	Status in this release	Level	Runtime requirements
Windows 10/11 x64	published	first class	nothing beyond the OS (UCRT is part of Win10+)
Windows 11 ARM64	published	first class (launcher artifact)	nothing extra; the launcher runs natively, the game itself runs through the OS x64 emulation layer with an x64 JDK
macOS 12+ Apple Silicon	built by CI, not published	first class (unverified)	nothing; unsigned build, needs the Gatekeeper workaround
macOS 12+ Intel	built by CI, not published	first class (unverified)	same as above
Linux x64, X11	built by CI, not published	first class (unverified)	libxkbcommon, fontconfig, libGL (or software renderer), libxcb
Linux x64, Wayland	built by CI, not published	supported (unverified)	wayland-client, libxkbcommon, plus the X11 set for XWayland apps
Linux arm64, X11	built by CI, not published	first class (unverified)	glibc 2.35+, libxkbcommon, fontconfig, libGL, libxcb
Linux arm64, Wayland	built by CI, not published	supported (unverified)	the above plus wayland-client
Windows 8.1/8/7	not built	unsupported	the baseline is Windows 10
Android — Termux + X11	not built (no CI slot)	experimental, not promised	CLI only and only when built from source; GUI unverified

Both arm64 rows are formal matrix slots, not the experimental Termux path: Windows ARM64 ships here and is cross-built with the same static-CRT gate as x64; Linux arm64 builds on a native ARM64 runner and joins this list once someone has run it on real hardware. The rows above and the matrix table in packaging/README.md §9 are the same list — change one, change the other.

Install

Windows — put the .exe anywhere and run it (pick _windows_arm64.exe on ARM64 Windows, _windows_x64.exe everywhere else). The first run creates .ULL/ and .minecraft/ next to the exe (portable is the default data mode); the per-user %APPDATA%\ULL plus %APPDATA%\.minecraft, or a custom root, are selectable instead.

Linux / macOS are not part of this release; their asset names are already fixed by the same rule (unlucky-launcher_{{VERSION}}_linux_x64.tar.gz, _linux_arm64, _macos_arm64, _macos_x64) so the links will not change shape when those slots open.

No GPU? Software renderer

The UI renders through wgpu (GPU) and falls back to the tiny-skia CPU rasteriser when no usable adapter is present; --software-renderer (or its equivalent --renderer=cpu) forces that path.

Verify the download

SHA256SUMS.txt lists exactly the assets attached to this release (Windows only), and sha256sum -c checks the ones you actually downloaded:

sha256sum -c SHA256SUMS.txt --ignore-missing   # Linux / WSL
shasum -a 256 -c SHA256SUMS.txt                # macOS (sha256sum is not bundled)
Get-FileHash .\unlucky-launcher_{{VERSION}}_windows_x64.exe -Algorithm SHA256   # Windows PowerShell

{{SUMS}}

Known limitations of this build

• Microsoft (MSA) sign-in needs an Azure public client id, and release binaries do not carry one: set ULL_MSA_CLIENT_ID=<id> before launching, or build with that variable set. Without it sign-in stops before any network call, and the GUI banner says so plainly: the title "Microsoft sign-in is not configured", a body naming ULL_MSA_CLIENT_ID=<id> (set it, or build with it, then restart the launcher — a running process does not pick up a new variable) and Code: msa_not_configured, with no Retry button. Every other sign-in failure keeps the generic banner plus its own Code: line, with the full reason only in the launcher log. ull accounts add msa prints the same fix on the command line. Offline profiles and authlib-injector servers need no id.
• Binaries are not code-signed / notarized yet: Windows SmartScreen and macOS Gatekeeper warn on first launch. The checksums above are the integrity reference for now.
• When the macOS slot ships it is the bare binary (single-file promise), not a .app bundle: no Dock icon or Finder double-click — launch it from a terminal.

License

Apache-2.0, third-party notices in NOTICE. Not affiliated with Mojang or Microsoft; no game files ship.

UI framework in this build

Every asset here is built from the iced UI (crates/app-iced, iced 0.14, MIT); no other UI framework is linked into it.