Transfer 2k to 2k3 official

I finally made up my mind I switched back to 2k3 and there is no way of changing my mind, because 2k can't play mp3s.

What I need help with is transfering from one to another.

I transfered it and I thought it was fine but the monsters group button no matter what you do will pop up telling you, that you have an error with the hexadecimal number and will not correspond to the other hexadecimal number. Not only that but the game will not start up at all, when I test play it tells me that there was some error and that it will not test play the file.

Now how do you transfer over correctly without having problems such as these?