Looks like you might have to download the latest version of Booksmart that was put out on 24th Jan? I think I'm going to have to do the same.
uploading from booksmart
why is it failing
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tried downloading latest version still won't work
I began preparing this book before Christmas 2015 and have only just completed it. When I attempted to upload it, you informed me that in January 2016 you upgraded Booksmart and that I can therefore no longer upload my book using the system under which I had created it. You further informed me that I must download the new version of Booksmart in order to upload my book, and I have done this - but it still refuses to upload my book.
Why is your system failing me? Do you expect me to start recreating my book from scratch under your new system before I can upload it?