I would like to know regarding the testing domain, I currently have one licence forum and still working to modify some issues in development mode. Then few months later, the forum will be run publicly soon by users and guests discussions. In order to avoid disturbing the forum process, how do I upgrade the forum offline or online by adding some features or new categories nodes? Buy new domain for testing with same license which I have now? How do other forumers's message 'It will be back in 15 minutes for upgrading or etc' ?