I just tried downloading 1.17 and it still works, and lets me move mobi files into Calibre. I also use this hack as a way to back up the mobi files I buy via Amazon Kindle, so they are on my hard drive (Kindle has been known to delete books previously purchased with no warning). I also kept a copy of the 1.17 installer for future use, if needed. Now to go back and do this for all the books I bought the last year! Thanks everyone for the great help!