ComfyUI-Manager/scripts/install-manager-for-portable-version.bat

.\python_embeded\python.exe -s -m pip install gitpython
.\python_embeded\python.exe -c "import git; git.Repo.clone_from('https://github.com/ltdrdata/ComfyUI-Manager', './ComfyUI/custom_nodes/ComfyUI-Manager')"