It still opens the save dialog for every pdf in the bundle. It also missed some, and at least one had some sort of error which prevented it from displaying in my default reader, the Edge browser. On the plus side, it gave the files better names than when downloading without the extension and created a directory structure for the bundle I was downloading.

It used to work, but now it seemingly only downloads one book from each bundle and doesn't do anything else. I can't seem to get all my books to download like it used too so I can back them up to other drives...

I would say that this add-on is OK, but not quite what I wanted. The file renaming feature is what drives me crazy sometimes. It is based on what the developer thinks is good, but that is not necessarily what I want. It would be great if the file renaming feature can be optionally disabled. For me, I already have my own method of using the default file names as set by Humble Bundle, so I don't need someone else to screw that up. So please let the user optionally disable the file renaming feature. How hard would it be to implement that? I'm not asking for anything really fancy here. Until that disable option is made available, I am not using this add-on.

Edit: to clarify, one of the reasons why I choose to not have something else (like this add-on) rename files for me is because, by preserving the original file names, I can very easily verify that I already downloaded it by trying to re-download it with the browser set to prompt me. Using that method, the browser will also tell me if the file already exists in the download directory. If the file was renamed, this would not work and I would have to, instead, manually and visually compare the names of the downloaded files with the names on the download page, which can be very error-prone and much more time-consuming, especially if you have multiple books with similar titles (like in packs of comic books). Unlike other users, I do not blindly trust software like this add-on to be perfect all the time and not miss any book during the downloads. I also don't trust that it will always properly rename files, especially since it cannot control how HB constructs the original textual strings of the file names. So, if the add-on gave me the ability to disable file renaming, I can more easily verify that it did not miss books during downloads.