Log-in kurviger Tourer plus on a 2nd Smartphone

After installing the app on my first Smartphone I would like to use my account on a further Smartphone and probably Tablet. After signing in on my 2nd Smartphone i was surprised to find the free version only and not “Tourer plus”.
Is it necessary to purchase a 2nd “Tourer plus” Account ?

You probably need to sign in with the same account: I can't access my Kurviger Tourer subscription [Kurviger Knowledgebase]