Thanks for the reply. No need for a refund. It does seem to be a 32-bit/64-bit thing; I bought a copy on Steam as well and that is the error it throws. No matter. I'll look forward to playing it on Windows or through wine sometime in the future, and of course, if you ever get a Mac again, I'm sure I can't be the only one who would be glad to see the app updated. Thanks again, & all the best for your current and future projects.