Hi Magdalena,
Thanks for reaching out.
There has a button to deactivate the license on your existing installation. You will able to deactivate it with your own from Bluishost Licencing.
To activate the theme on a new domain/sub-domain/directory/sub-directory, please deactivate the purchase key/license from the existing domain/sub-domain/directory/sub-directory where it installed now.
If you are unable to do it with your own for the reason of deletion of the installation then confirm us to revoke the installation for you.
Best Regards,
ThemeLooks Support Team