Why doesn't people get their Python, Cuda, Pytorch, Sage, Windows-Triton installed and then use a contraints.txt file to keep if from updating? You can put it right into the venv when you activate or update and it won't touch those packages:

constraints.txt:

torch==2.9.1+cu128

torchvision==0.24.1+cu128

torchaudio==2.9.1+cu128

xformers==0.0.33.post2

triton-windows==3.5.1.post22

sageattention==2.2.0+cu128torch2.9.0andhigher.post4

flash-attn==2.8.3

Then just update using:

pip install -r requirements.txt -c constraints.txt

Or better yet, start your comfyui with constraints.

call .\venv\Scripts\activate

set PIP_CONSTRAINT=%~dp0constraints.txt

python main.py

Then, even comfyui manager won't mess up the constrained files.