When you click on a file to download, you may be prompted to register if you are not an auralgasms user. When you click the Register button, if you are taken to a Register screen with Yellow and Orange text, that is the wrong screen and the registration will not work.
Instead, click on the Register item on the top level menu. That will take you to the correct registration.
Sorry for the confusion. This will be fixed on April 28th in the evening.