With Fragen-Lern-CD version 6.0 and up you will find a registration code on the left inside of your CD case. You can use this code to register with FahrAPP if you no longer want to learn with the CD, or if you just don't have a drive anymore.
First please uninstall the Fragen-Lern-CD.
Download FahrAPP on your smartphone
or another FahrAPP version from https://www.fahr.app
. Open the app, click on "Register" and enter the registration code from the inside of your CD case (you do not need to provide a driving school code / Fahrschulcode).