If you read above you’d see the problem.
CE does not qualify as ‘Premium’ and Q&A has slipped as you should not be able to view or install that app. You need Starter at a minimum.
If you are running Rocket I’d also pay close attention to this. They do NOT support older OSs, even if they are LTS maintained. Largely because they use and rely on a lot of more modern packages that do not always play nicely. You will do an update one day and that will be the end of it.
So yes, your OS may have security releases, but Rocket will not support it. (and yes, I see both sides - I hate latest and greatest and broken things)