We have moved your question into a new thread because it was posted in the iRobot Roomba Movement Panel robot skill.

Instructions

Ensure you have an internet connection when loading ARC for it to obtain the list of robot skills. If you do not have an internet connection, your computer cannot speak to the internet to receive data.

Documented here: https://synthiam.com/Support/ARC-Overview/robot-skills/Syncing-and-Updating-Robot-Skills

That document has a section describing how to force the robot skill list update. Downloading and other online communication requires the Internet.

OK thanks all good now!