I installed the tampermonkey version and cleared my cookies & cache, but it seems to still not be able to download

I generally only download the .opus files, but for the sake of showing the bug I tried each format. I also tried different kbps which is why I tried downloading .opus twice.

Here are all the ones that failed that I can remember, but it's becoming apparent that it wont work for any video:

Just to be safe, I also tried downloading audio from non-music videos and it also didn't work

Also, based on the timestamps of files, the problem seemed to arise between 1:44 AM, 06/16/2018 and 8:52 PM, 06/16/2018 in Eastern Daylight Time

Hope this helps :)