I would suggest writing to the publisher and offering to exchange the disk you have for a new one.
After all, the production cost of the disk is next to nothing. And if you offer to send them a valid disk that they published, then it’s obviously not a scam to get a free disk. I’d think that a sharp customer service person would see that they can make a legitimate customer happy for little more than the cost of postage… to send you a new disk gratis.
@WasCy -Good suggestion and I had considered this but because I am the most impatient woman on the planet I figured I could perform a do-it-yourself kind of miracle….sigh