You can at any time switch license to another domain or server free of charge. Just login into your customer area:

http://my.cubescripts.com

Go to My Packages. Choose your package and go to licenses. Under your license you should see status active. There should be option next to it Reissue. Once reissued just re-validate your license from your new domain/script control panel.

If you do not see this then your license is probably either suspended or expired.