Updated book download problem in Adobe Digital Editions

Problem:

I have downloaded a book in Adobe Digital Edition. it downloaded successfully. But after some days vendor emailed me to re-download the same book, becuase it has some invalid content. I tried to re-download the book, but it is showing old book. On the other hand i download the same book on another computer, i got new book. is it Adobe Digital Editions problem or something else?

Any help would be highly appreciated.

Thanks