During the last few days, I finished, packaged and tested the new 1.1.5 version of Portal: Prelude, and I decided to upload it to ModDB.com on Saturday. Then, when I saw they accepted the file on their website, I wrote a news on ModDB and announced the release.
And today, I realized that the file that was uploaded on their website was totally corrupted. I don't know when and who really corrupted the file, and I don't care. The problem is that ModDB mirrored the file everywhere. I'm now trying to re-upload the whole installer and will try to replace every corrupted version I can find. The problem is that 800 MB takes some time to upload (2 hours with my brandwidth).
Sorry for the inconvenience.