Hello Krisztina Janosi ,

You can self-reset your license via your account/licenses as follows-

Once reset, you will be able to activate Studio once again.

Thanks, I was not sure what that button does, so I didn't dare to push it:)

Hi again, 

I tried resetting the license, but the attempt failed due to an error. I tried again, same error. Could you please deactivate it for me. Thanks a lot. 

Krisztina Janosi Support Case Id : 00607519. Support case has been logged for your assistance. Please check your SDL Community email address for updates.

Krisztina Janosi Support Case Id : 00607520. Support case has been logged for your assistance. Please check your SDL Community email address for updates.

Thanks a lot.