I have purchased the full package for a few days and in the category screen to select the car, it appears that I have them all. But in single mode when I select the car, in the section, ADAC GT MASTER 2018 or GTR3, the porsche 911 GT3 R (2018) must be purchased, while the porsche 911 GT3 R (2019) is available. For what reason?
Due to licencing agreements with Porsche the model of 2018 had to be taken out of the store when the 2019 model was released. There is still some confusion within car selection screens. 2018 is not available any more.
You can find the Porsche 2019 in the GT3 category. I also had the same problem or wonder. The fact that the old car is still visible is a bug . Best regards.