ussoewwin

/

Flash-Attention-2_for_Windows

like 22

depends on when you have downloaded/install Comfy, also if you have installed app or portable..
you need to know what python version you have
what torch version, what cuda version
then you go and check to download the corresponding package

i have for instance, in my portable Comfy:

xformers                                 0.0.32.post2
flash_attn                               2.8.2
sageattention                            2.2.0+cu128torch2.8.0
torch                                    2.8.0+cu128
torchaudio                               2.8.0+cu128
torchvision                              0.23.0+cu128

on
### Loading: ComfyUI-Manager (V3.37)
### ComfyUI Version: v0.3.75-1-gf16219e3a | Released on '2025-11-26'

and you might find the correct version for your setup here
https://github.com/wildminder/AI-windows-whl?tab=readme-ov-file#available-wheels

scroll a bit down, there's a table with the corresponding links

regards, /Hans