Not sure if anyone has found this.

After watching the following youtube video I managed to download a couple of files by using https://www.cometpingpong.com/app/download/4741080860/ then appending one of the filenames to the URL shown in the video e.g. https://www.cometpingpong.com/app/download/4741080860/6ss92y91o2piwf77.zip

They seem to be encrypted but I am sure someone with more skills than I have would be able to get in to them.