Just to be sure, were you referring to the MSFS version ? I'm asking because, your reference about "activating it via addon tab", seemed to be related to FSX/P3D, we don't have such thing in MSFS.
In any case, thank for reporting it worked after running the updater, which is weird on its own, since what the installer does as the last step of its installation, is precisely that: run the updater to be sure you are the latest version upon installing.