@MannavaVivek
you should do a upgrade pip before installing rasa-pro so run:
pip install -U pip
I also use uv package which makes installing python packages super quick. So for the latest version of rasa-pro, in a fresh virtual environment, I do:
pip install -U pip
pip install uv
uv pip install --extra-index-url https://europe-west3-python.pkg.dev/rasa-releases/rasa-pro-python/simple rasa-pro==3.8.0