Deactivation of old unused Toolbox license

How could I deactivate an old (once used but currently unused) toolbox license?
I like to use an old Parallels 12 on an old macbook. The parallels12 license is now active (was deactived before) but the toolbox license is listed as activ and I could not activate the tollbox.
@ParallelsSupport: How could I deactivate this license so that I could activate it again? Any help?
Thx

 

Hello Stefan, Please replay in a personal message with the Parallels Desktop account details.

 

remove old license, or unistall Toolbox and reinstall Toolbox with new license.

 

Hi, we appreciate your response.

 

Great idea, if you have access to to previous installation, which I haven't got anymore :-O
Other Ideas?
So please @parallels: just set all my licenses to inactive ) - Wonder why I could not do it with my paralles account by myself.

 

Hello, kindly explain the issue you are facing inside your Parallels account so that we can understand better and help you out.