This is a userscript that will download multi episodes form KissAnime.
Sorry for the late reply,
Beta server is responding with a 429 http error, and the way that this error can be baypassed is to retry it until it works. But IDM doesn't have an option for that.
So I'm planning to create my own downloader which with baypass this error.
Thanks, AnimeBro1
IDM option not fetching links on Beta Server
It seems that the IDM option does not fetch the links coming from the Beta Server on Chrome. It would be good if that would be fixed or Add/Modify the server since some RapidVideo links are dead when fetched.