got an email from them. I stated in my first message to them, I couldnt remember the email I used to buy the program..
got this reply, that does not help one bit.
Hello,
To change your e-mail address, retrieve your keycode or change any other aspect of your account including mailing lists and mailing address’, please log in here:
http://www.prolific.com/store/login.php
Please be aware that changing your email address will not change your username. Your username is usually the email you first registered with and cannot be changed after it has been set.
Enjoy!