Chassidish Yiddish - Complete the Audio, Fix Errors

I’ve been taking the course Chassidish Yiddish Complete (with some audio). I’ve noticed a couple of mistakes - it would be great if they were fixed. And also the course is described as “with some audio”. And that’s correct. The audio is great - but it stops after a 100 words or so. It would be wonderful if the audio would be completed. Can you or I contact the course authors in some way? What would make it worth their while to complete the audio, correct errors?
Also is there a memrise yiddish group that I could join? How would I find it? Thanks.