I've notice when my updater gets to the FSX/P3D part it quits.
As explained many times, if you run the Updater with the "Live Update" icon, it will quit at the end, performing only the steps for the product you actually have installed so, unless you installed everything, you'll never see all steps performed, and since at the end of the last step, there's nothing else left to do other than quit, it quits.
Report a problem only if you see actual errors.