Just recently, when I add a game to the downloader, it will show up as completed, and won't download.
Anyonw know how to fix?

Here's the standard answer . . . =)
Use your browser

Or

Downloader Issues Link

Have you tried reinstalling Adobe Air? The new version of Air seems to have made the downloader much more stable.

I am so stupid. I've actually downloaded these games months ago and forgot about them, so that's why the downloader was showing them there already. I did look, though! It's just that I didn't account for the file names to start as "setup_".

If one of them is Divine Divinity the setup.exe has been updated to V1.005A. If you downloaded it after about Feb 12 it is the updated version. If you have installed the game, on the bottom right corner of the DD start screen it should say V1.005A, if not you should uninstall and redownload to get the patched version.
I think that is the only setup.exe that has been updated but I could be wrong.