EPUB book from Apple Books store cannot be opened with iBooks Author
I've just purchased a book from Apple Books store. It is in .epub format. When trying to open it with iBooks Author via File>New from EPUB file..., no matter which template I choose it gives me an error message: This file couldn't be imported because it's in unsupported format. In the meantime, the book is properly viewed in Apple Books app. Any ideas?
null-OTHER, macOS Mojave (10.14.1), Books and iBooks Author