It being corrupted during download is unlikely since the archive wouldn't open if it was corrupted and it only fails during the unarchive process. But just in-case I tried to re-download the file 3 times using 3 different methods (2 different browsers and a download manager), all the files are exactly the same (matching checksums). The error I get is still the same: "invalid zip file with overlapped components (possible zip bomb)".
Using a different program I was able to unzip it, but it also complained about the ZIP file, giving the following message: "Headers Error", but everything unzipped correctly and the game launched.
Really enjoying the potential this game has. One thing that did bug me was not being able to get a frontal view of the character, or did I miss a way of doing that? Either way, keep up the good work.
On that note it might have something to do with how big the ZIP file is now, from my experience RAR files are usually better when things get this big. Might want to give it a try at least :)