Sheesh, the first 2 books I pulled down worked. I bought 2 more with the funds left on gift card, these do NOT work. They get the DRM message after you pull them into Calibre. The only thing these 2 books have in common is fairly recent releases, same author (Roger Scruton). So yeah, even on Win10 there are issues. I think it's fair to say they've broken Alf's utility. Same old BN, confirms why I dropped them years ago, and I hate wasting time messing with their customer service. They've permanently lost me as a customer on ebooks, though if I can get a refund on these 2, I'll still buy paper books from them.