Hello,
Please try to activate theme now.
Note that you may use the 1 license for the 1 dev domain and 1 live domain. But keep in mind that you can use our theme license for 1 end product only, please read more – https://themeforest.net/licenses/standard
Also, to activate the theme on new site you need to deactivate it (via Theme Options) on old site.
Regards