First, You need to download Microsoft toolkit 2.4 beta 6. Secondly, you choose install product key for office 2013 pro plus. After you do this, it will give you 30 day trial. When you want to have this 30 day trial again, you click 'rearm' from 'activation' tab in this toolkit. You can confirm it by clicking 'check' button. I tested it and it works again. While waiting for a permanent activation solution, this is as good as you can get at this moment.