Using the 907 theme in different subdomains

I purchased the 907 theme and need the demo pages so I can alter them to fit my needs. How do I get this done in different subdomains of the same domain? When I try to put the license it says (in the second subdomain) it says it’s already in use.

Theme:

Hi

Each license will work only for one end product. One license you can use only for one time mean only for one domian/subdomian. So, for each individual subdomian you will need individual unique license.

Hope you understand.

Thanks