install python 3.12 ,

https://www.python.org/downloads/release/python-3120/

and make sure path setup then

Install PyTorch Nightly (with CUDA 12.8 support)

python -m pip install torch==2.8.0.dev20250426+cu128 --extra-index-url https://download.pytorch.org/whl/nightly/cu128

then the xfomers will work

ComfyUi recommended python 3.12

for xformers install

python -m pip instal https://huggingface.co/czmahi/xformers-windows-torch2.8-cu128-py312/resolve/main/xformers-0.0.30%2B3abeaa9e.d20250426-cp312-cp312-win_amd64.whl

install python 3.12 ,

https://www.python.org/downloads/release/python-3120/

and make sure path setup then

Install PyTorch Nightly (with CUDA 12.8 support)

python -m pip install torch==2.8.0.dev20250426+cu128 --extra-index-url https://download.pytorch.org/whl/nightly/cu128

then the xfomers will work

ComfyUi recommended python 3.12

---

for xformers install

python -m pip instal https://huggingface.co/czmahi/xformers-windows-torch2.8-cu128-py312/resolve/main/xformers-0.0.30%2B3abeaa9e.d20250426-cp312-cp312-win_amd64.whl

ok