I actually tried it before I saw the warning, and got a response saying, "that download is temporarily unavailable". It did give a contact email, so I may try that, just to see what they say.

I agree about the vast quantity, but I'm not quite sure it's vast enough to commit to the year. For example, a fair number of bands show downloads available, but they only have a track on a compilation.

Did you go for the twelve-month option or the three?