The subject line contains the error I get when trying to read two e-books that I purchased from MSBDirect.com. Their initial reply was basically instructions for finding this forum and looking for support. The support posts that are related to this same error message suggest getting a new link from the seller. They are refusing to give me a new link, their replies, obvsiouly canned, state that they don't "support" that product any more because it is over a year old. So, now two books that I paid for are unavailable.
I have little hope, but is there anything that Adobe support can do to help in this situation?
Unfortunately no. This error (Resource Unknown) indicates a misconfiguration on the seller's part (specifying the wrong book id in the link they gave you), or on the part of their back end service (giving the seller the wrong book id). You will need to contact the seller to get support on this, so that they can work it out with their back end provider.