Click "Download lic.txt" opposite the active and paid license on the website

Go to http://your-domain.com/lic.php or http://ip-servers/lic.php

Paste the license string + ALL the contents of the file into the text box (including dashed lines) lic.txt and save

Refresh the page, the system should work. (If you have a new server you may need to reinstall, if you already have data on the server then contact support)