When one rolled back the Rocket version to an earlier one in the Rocket options, one cannot update back to the current version afterwards. I did not even see a hint on the WP admin plugin list page that there is a newer version as it is the case when you rollback WP repository plugins. I had to go to the Rocket website and download the newest version and deinstall/reinstall Rocket. But perhaps I overlooked something.
A button with this function “Back to the current version” would be fine!