I ran into the same problem. I don't normally download stuff or apps or use a download manager, but i had problems with the premium player, so i tried downloading a video with firefox but it failed partways. I have used my api key for premium podcasts on pocket casts, but the api page doesn't show any problems.
I am also running into the same "Based on your subscription level, this content is unavailable" problem using IDM to download on Chrome. Tried logging out/in and it didn't fix it. FWIW, I can watch content fine on the site, but i'd like to be able to download videos since my internet isn't always good, and I sometimes watch videos on my TV and have no way atm to stream.
Hey me too, for a minute there I thought my subscription had ended, but it seems a lot of us are having this issue. FWIW this week I downloaded three videos but also I assume that those didn't exceeded the download limit (the size of them combined must be a little over 3GB) As a fellow developer I know that when things break due to small changes and support starts getting tons of the same error reports it can be a bit stressful (or maybe that's just me) so I just hope it gets fixed!