Hello @Byungju,
I checked your account, I can see you have only 1 license for S32DS 3.5 under the activation code which ends with 'F3F7'. It was still assigned to your previous Windows OS so that is why you received this message. I have returned the license from within the server, so this should now be resolved.
I also noticed you have another activation code on your account for S32DS 3.5 which contains 101 licenses. This code ends with '3250'. I would suggest that you use this one since it contains many more licenses and you wouldn't likely face this issue again.
Best Regards,
Mike