Sorry about the previous problems with downloading. You see, I decided to make the download structure more search engine friendly. So instead of a download URL look like /download.php&ID=2 or whatever it was showing, the structure NOW looks like /download/filename which looks and feels more natural.
Sadly I screwed up the configuration of this and ended up breaking all the downloads. I actually got a few emails from people informing me of the problem - thank you! Not only is that kind of you, but it also says "Hey, people actually care about the stuff on this site!"
So, in the end, I fixed the issues and all is running. Be sure to download Yodm 3D, because it's awesome.