If you do not uninstall Flash Player, your existing Fragen-Lern-CD should still run in 2021 (note that the question status contained is only valid until March 31, 2021). In addition, EVERY Fragen-Lern-CD comes with a full FahrAPP account! Download the FahrAPP in the Google Playstore or Apple Appstore and register with the registration code from the CD case.
The latest Fragen-Lern-CD is version 6.5 (good until the end of March 2021).
If you are learning with an older version (and not online with FahrAPP), the questions on the CD are not up to date. In the future there will no longer be a Fragen-Lern-CD, because there are hardly any computers left with a CD or DVD drive.