How setup license in Supro theme

Hello I bought SUPRO theme for magento, but mydomain.com is run the old CMS until I configure magento that runs in developing.mydomain.com

After I installed SUPRO, I find the next issue : they ask for set the license in mydomain.com instead directly in my subdomain. But I can’t do this because I running the old CMS in the mydomain.com

Did any had this experience and teach me the easier steps to license for mydomain.com and my current subdomain.

Thank you in advance, Juan