You don't need to keep the window open, it can work in the background.
Replace the button.png and scroll.png with the ones from your Wabbajack window, if it works out of the box, you don't need to change anything
git clone https://github.com/ninthy/wabbajack-dl.git
cd wabbajack-dl
uv sync
uv run main.py
or use the exe on the releases page