Extending a course with audio

I really enjoy this course (https://www.memrise.com/course/156185/das-neue-praktische-chinesisch-1/) matching the textbook that our class uses. Is it possible to fork/copy/extend the course with audio?
I found these (http://www.chinese-lessons.com/download.htm) audio files, licensed CC-BYNAND and would like to include them, if given the right I would even do it myself but I can’t seem to contact the original creator of the course…

Is there a way to fix this? Then, follow up courses could also be supplied with audio files.

EDIT: I’ve seen that the usual answer is to tag @MemriseSupport / @Lien to ask for help. So hey, could you please help me out with this?