After install rasa in venv, I tried to install rasa-x with pip3 which is up to latest version.
sudo -H pip3 install rasa-x --extra-index-url Simple Index
Collecting tensorflow-cpu~=1.15.0 (from rasa<=1.7,>=1.6.1->rasa-x)
Could not find a version that satisfies the requirement tensorflow-cpu~=1.15.0 (from rasa<=1.7,>=1.6.1->rasa-x) (from versions: )
No matching distribution found for tensorflow-cpu~=1.15.0 (from rasa<=1.7,>=1.6.1->rasa-x)
Yes, the second way is the recommended way to run Rasa X. Where are you getting stuck in deploying it According to the Docker-Compose Quick Install docs?