copyToDVD SE sound problems

I use CopyToDVD SE a lot. I just downloaded an update and want to customize the sounds in the manager. However, when I change the sounds to my own sounds and click apply the default sounds come back.

I know this can be done, because I did it in the earlier version.

BUT I FORGOT HOW!

I am sorry - can someone help me.

I know lots of people don't like this program but it is free and does everything I want.

All help will be appreciated. Thanks