Good News Primer 2 is a simplified version of Gospel Bridge which is a step-by-step 17-page presentation of the Gospel.
The rest of the mp3 files can be found at: https://www.dropbox.com/sh/vzsre54oycnv2an/Y_sVx6xXsf
However, as the mp3 files are recordings of an earlier edition, there may be some slight differences between the mp3 files and the text.