As of January 30th, 2012, all RWWGuard protection agents are completely FREE! That means there is no longer an option to purchase a new license key.
Simply uninstall the current version, download the latest installer from https://helpdesk.kaseya.com/hc/en-us/articles/218320237 and you will no longer have any licensing checks for the RWWGuard agent. It still includes all the functionality of the previous version.
Note: We recommend that you first back up the HKEY_LOCAL_MACHINE\SOFTWARE\Scorpion Software\RWWGuard registry hive as a safety precaution. The standard warnings about editing the registry apply.