Hello,
I have tested the scenario and this is indeed the case. It seems that the accelerator keys for the "Back" button and "I agree' are the same, the "z" key set using the "&". We would like to thank you for reporting this issue. It has been brought to the attention of our development team and it will be solved in a future version of Advanced Installer.
As a workaround, you can go to the
Translation page -->
Default Strings and look for the "RadioButton.Text.IAgree#1" Localization ID.
Once you have found it, on the German list, edit the line so the accelerator key is not on the "z"
Example :"Ich stimme der Lizenzvereinbarung &zu" --> "Ich stimme der &Lizenzvereinbarung zu"
Or to whatever letter best suits your needs.
Best regards,
Dan