You should be able to find it at a number of different places around the web. You can google 'download Kindle for PC 1.17'.
NOTE: At time of writing, DeDRM does not work with the newest version of Calibre (5.0), so stick to the latest 4.x version until you hear otherwise.Download and install Calibre and DeDRM tools.I wrote up this step-by-step guide for my girlfriend, so I figured I would share it here. This is probably retreading old trails for most people, but after a LOT of research, I wasn't able to find a single place that just listed all of the steps for importing Kindle books into Calibre. If the book was released before then (even if it was downloaded after), then it should still work. Edit: NOTE - This process no longer works for Kindle books that were released after February 2023.