Well you should have the trial version right!?
push already paid for, then open the keygen.....
Generate a key and insert it in the serial slot, and when the program accepts it and asks you how you would like to register, pick "by website" or whatever it says.....
Then a website should open up automatically if I remember correctly.....
Finally, copy and paste the website's URL into it's corresponding location on the paid for registration and hit okay or what not.....
Voila, however you may have to try this several times before it works.....
It took me 3 tries.....