I would like to move my Udesign theme to be active on a new domain. I deleted it off the original domain and then did a clean install of Wordpress on that old domain. I still have my purchase code but it appears to be tied to the old domain. Is there any way to activate it on the new domain without having to purchase again? I am only using it for one domain…it just happens to not be for the one I purchased it for originally. Thanks in advance.
By the way, I did not deactivate the theme before doing a clean WP install on the old site 
Most likely you won’t be able to activate the theme on a new domain as it’s a new end-product.
You will need to purchase a new copy for that.
1 website = 1 license ( end-product )
2 website = 2 licenses
Although, some authors are OK with domain change, you will need to contact the item author if they’re fine.