I need to reinstall the software but I've lost my registration code. What should I do?

You don't need the registration code any more. A new license file is required to run DVD Audio Extractor 6.0 and later. Please follow the guide at http://www.dvdae.com/dvdae/tutorial/upgrade to upgrade your license for free.

If you are already using version 6.0 or later, just download your license file again from your account.