ComfyUI for Windows (Installer + Launcher)

Fast, repeatable ComfyUI setup for Windows 11 with CUDA 12.8. This repo installs a clean Conda environment, the right PyTorch build for your GPU, and a lightweight supervisor that launches ComfyUI headlessly and shuts it down cleanly when you close the window.

Highlights

• Windows 11 tested end-to-end
• Conda env: Python 3.12.11 (falls back to latest 3.12.x if needed)
• PyTorch CUDA 12.8 wheels (fallback to CUDA 12.6 if 12.8 is unavailable)
• Foreground launcher: Ctrl+C or closing the window kills all subprocesses
• Log-based watcher (no HTTP probes), gentler restarts, rotating logs

Status (2025-08-12)

ComfyUI Desktop exists, but this installer is still maintained for users who want to host or run ComfyUI as a service/foreground process on Windows. The scripts and CUDA 12.8/Python 3.12.11 stack are up to date and ready.

Prerequisites

Make sure you have:

• NVIDIA GPU drivers (latest) — https://www.nvidia.com/Download/index.aspx

• Git — https://git-scm.com/downloads (Git LFS recommended)

• Miniconda — https://docs.conda.io/en/latest/miniconda.html

  After install, in an elevated Conda prompt run:

  conda init --all --system

• (Optional) Microsoft Visual C++ Build Tools — some nodes may need it: https://visualstudio.microsoft.com/visual-cpp-build-tools/

Install or Update

1. Clone or download this repository.

2. Run the installer:

   install_update_comfyui.bat

What it does

• Creates/uses Conda env "ComfyUI" with Python 3.12.11
• Installs PyTorch + CUDA 12.8 (falls back to 12.6 if needed)
• Installs onnxruntime-gpu (falls back to CPU)
• Clones/updates ComfyUI into %USERPROFILE%\ComfyUI
• Adds a few helpful custom nodes (see below)
• Verifies versions and cleans pip cache

Models

Use the helper to fetch models defined in model_config.yaml:

install_models.bat

model_config.yaml example:

unet:
   my_model:
      repo_url: "https://huggingface.co/..."
      include_files:
         - example.safetensors

vae:
   another:
      repo_url: "https://huggingface.co/..."
      include_folder: vae

Launch

Start ComfyUI:

launch_comfyui.bat

• Opens at: http://127.0.0.1:8188 (default)
• Foreground by default — close the window to stop everything
• Logs live under logs/ (rotated)

Quiet output

• Set HEADLESS=1 before launching to suppress the environment summary prints (process still runs foreground):

  set HEADLESS=1 && launch_comfyui.bat

Configuration (.env is optional)

You don’t need a .env file. Defaults work out of the box. If you want to customize paths/port/flags:

• HEADLESS: Quiet mode for launcher prints (1=quiet, 0=show env summary)
• COMFYUI_ENV_NAME: Conda environment name (default: ComfyUI)

Watcher tuning (advanced)

• ENABLE_NO_OUTPUT_RESTART=1
• NO_OUTPUT_RESTART_SECS=600
• QUIET_CPU_THRESHOLD=2.0
• QUIET_CPU_WINDOW_SECS=300
• BOOT_WAIT_TIME=1600
• MONITOR_INTERVAL=10

Included Custom Nodes

The installer clones/updates these by default:

• ComfyUI-Manager — https://github.com/ltdrdata/ComfyUI-Manager
• rgthree-comfy — https://github.com/rgthree/rgthree-comfy
• ComfyUI_ExtraModels — https://github.com/city96/ComfyUI_ExtraModels
• ComfyUI-GGUF — https://github.com/city96/ComfyUI-GGUF

You can add more by cloning into ComfyUI/custom_nodes/.

Service mode (optional)

If you prefer running as a background service, tools like NSSM work well. Point the service to launch_comfyui.bat and set a working directory for logs. Note that Ctrl+C behavior doesn’t apply to services.

Update / Uninstall

• Update: re-run install_update_comfyui.bat
• Uninstall: remove %USERPROFILE%\ComfyUI and the Conda env ComfyUI (e.g., conda remove -n ComfyUI --all)

Tech notes

• Environment: Conda ComfyUI, Python 3.12.11 (or latest 3.12.x)
• PyTorch: CUDA 12.8 wheels by default, CUDA 12.6 fallback
• Supervisor: no HTTP/TCP health checks; uses logs + CPU quiet periods
• Clean shutdown: Ctrl+C or closing the console terminates the whole process tree

License

MIT. See LICENSE.

Credits

• ComfyUI by https://github.com/comfyanonymous/ComfyUI
• The authors of the included custom nodes