If you have already been using the free version of UnderConstructionPage, you can quickly update the plugin to the PRO version:
Customers who purchased and have a valid PRO license - contact our support via the contact form built into the plugin or use the general contact form. If you're using the later method please include your license key in the message or contact us via the email address used when purchasing. This speeds things along.
Using the free version? We have you covered too. Head over to the forums. First look at older threads and if you don't find anything useful open a new thread. Support is community-powered so it can take some time to get an answer. If you need premium support this second - upgrade to PRO.