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(Both Sean & I are from Microsoft) Your feedback about a walkthrough is appreciated. I'll work on updating our getting started with the talker nodes walkthrough. I am also working with our video team to produce a video walkthrough as well. I'll post when that is published.

To expand on what Sean said: During the initial setup, you ran choco upgrade ros-melodic-desktop -y. (Upgrade will do an install if it wasn't there before).

This downloads a package (a zip file) with a powershell script which expands the archive into the opt directory. It then runs rosdep on the package - which imports dependencies from our chocolately server.

If there is a network hiccup during that install, you may have a partially installed image. We have seen issues with catkin install, which we are trying to isolate. choco upgrade ros-catkin-tools will correct it.

There's also a Windows troubleshooting guide, which we are updating as we encounter situtations.

We will continue to monitor ROS Answers, and you can create a tracking bug here: https://github.com/ms-iot/ROSOnWindows.

Thanks! Lou