It was released for free, but to remove the time limit one had to register to receive a free key. Keeping the registration server up and running = work so we decided not to do this anymore due to low interrest. We figured most of interrested users already registered during the few years the server was up.
Oh well! It's a shame really but I understand. It was just a curiosity more than anything.
Any news on when version 3.0 will be released?