Aye, looks like Epic’s auth process changed ever so slightly. Problem with writing unofficial third party code, heh.
I’ve updated the repo and instructions in the first post, you should be able to re-install via npm to get the latest version and it /should/ work.
As for Learn assets and other things, I believe the issue is that the manifest files for these work slightly differently and I haven’t had time to isolate and correct for these differences. Maybe some day.