Citron Neo Windows Updater

Official external updater utility for Citron Neo (Windows only), built with Python + CustomTkinter.

It can pull builds from any of three official channels:

• Stable — https://github.com/citron-neo/emulator/releases
• Nightly CI (Clangtron) — https://github.com/citron-neo/CI/releases
• PR Builds — open pull requests on https://github.com/citron-neo/emulator/pulls; per-PR Windows artifacts are pulled from the **Build Artifacts for PR #N** comment (powered by nightly.link)

Upstream no longer ships the MSVC or MinGW-w64 Windows toolchains. The only Windows artifact produced is the Clangtron build (Clang LTO cross-compiled from Linux), e.g. Citron-windows-nightly-<sha>-x64-clangtron.zip.

For the PR Builds channel, the updater scans the most recently updated open PRs on citron-neo/emulator. For each PR it reads the build-artifact comment posted to the PR, extracts the Windows Clangtron download URL (only URLs hosted on nightly.link are accepted), and presents the PRs in a dropdown together with their build status (ready, building, or no Windows build).

Features

• Automatic update check on startup
• Manual Check for Updates and Update Now
• Current version vs latest version display
• Switchable release channel: Stable / Nightly CI (Clangtron) / PR Builds (Nightly CI is the default)
• Modern dark-mode UI (CustomTkinter)
• Download + extraction progress bar
• Detailed log panel
• Configurable install path (default: %APPDATA%\citron)
• First-run setup popup to choose install path
• Optional import from older portable install (user folder copy)
• Launch Citron Neo directly from updater
• Error handling for network/download/extract/permission failures

Project Structure

• main.py - entry point
• ui.py - CustomTkinter user interface
• updater.py - core update logic (GitHub check, download, extract, replace, launch)
• requirements.txt - Python dependencies

Requirements

• Windows 10/11
• Python 3.10+ recommended

Setup (Development)

1. Create and activate virtual environment:

   py -m venv .venv
   .\.venv\Scripts\Activate.ps1
   

2. Install dependencies:

   pip install -r requirements.txt
   

3. Run:

   python main.py
   

Usage

1. Launch updater.
2. On first run, choose the install/update folder in setup popup.
3. Optional: import data from an older portable install by selecting the folder containing user.
4. Choose a release channel (Stable, Nightly CI - Clangtron, or PR Builds).
5. Click Check for Updates.
6. For PR Builds, pick an open PR from the dropdown that became visible. The summary line tells you whether its Windows build is ready, still building, or has no usable Windows artifact. Use Open PR on GitHub to open the PR thread in your browser.
7. Click Update Now if an update is available.
8. Click Launch Citron Neo after success.

Switching the channel triggers a fresh check against the new repository. Builds applied from different channels are tracked independently — moving from nightly to stable (or to a specific PR build) will be detected as an update. Installed PR builds are recorded as pr-<number>-<short-sha> so re-checking a PR after CI rebuilds the same commit will not trigger a redundant download.

The updater stores config in:

• %APPDATA%\CitronNeoUpdater\config.json

And stores installed release marker in your install directory:

• .citron_updater_version.json

Building a Standalone EXE

Use PyInstaller:

pip install pyinstaller
pyinstaller --noconfirm --onefile --windowed --name "CitronNeoUpdater" main.py

Generated binary:

• dist\CitronNeoUpdater.exe

Distribute this single EXE as the standalone updater.

Notes

• The updater is designed to run as a separate process from Citron Neo so files can be replaced safely.
• If update fails with permission errors, close Citron Neo and retry.
• GitHub API rate limiting can affect anonymous requests in high-traffic scenarios.