Xeno443/ComfyUI_portable_python312

⭐ ComfyUI portable enhanced edition ⭐

• Updated 8th December 2025 with ComfyUI version 0.3.76

The current official ComfyUI portable has two slight disadvantages, firstly it does not come with Git portable which is occasionally required by custom node packs or to automatically models etc, and the latest versions come with Python 3.13 by default which still has (few) compatibility issues with some extensions.

So I am updating this version based on Python 3.12 with the latest updates and included Git and the ComfyUI-Manager node. Recently I added some custom scripts with which you can easily modify the embedded Python environment too.

➡️➡️ Download folder

This version is not supported or endorsed by Comfyanonymous!

🟨Usage

This portable version contains all components required to use ComfyUI without needing to install any additional components. The only thing your system needs are the Microsoft Visual C++ runtimes, but if you are not using a naked Windows install it is very likely that you already have those. If you don't have them you can download them here:

• Latest Microsoft Visual C++ Redistributable Installer
  https://aka.ms/vc14/vc_redist.x64.exe

After you unzip the archive you will find a few batch files in the main directory which must be used to run and modify the portable environment.

• run_nvidia_gpu_v2.bat
  This file sets up the necessary environment variables and launches ComfyUI

• run_nvidia_gpu_v2_fast_fp16_accumulation.bat
  Same as above but enables fast FP16 accumulation.

• run_nvidia_gpu_v2_sageattn.bat, run_nvidia_gpu_v2_flashattn.bat
  Same as above but enables the corresponding alternate attentions.

• install_sageattn1.bat, install_sageattn2.bat, install_flashattn.bat
  These install the corresponding versions of Sage or Flash Attention into the Python environment.
  Only use this if you know what you are doing!

• get-models.bat
  On a fresh install you will be missing a few essential/popular models and this file will download them for you.

• environment.bat
  Starts a cmd.exe within the portable environment. You can use this to manually modify the embedded Python.
  Only use this if you know what you are doing!

• change-pytorch.bat
  This allows you to switch to a different Pytorch version, or just reinstall the current one if you encounter issues.
  Only use this if you know what you are doing!

🟨Other

0.3.49 was the last version that came with Python 3.12.10, you can still download it from the official github, and I placed a backup in this HF. https://github.com/comfyanonymous/ComfyUI/releases/download/v0.3.49/ComfyUI_windows_portable_nvidia.7z