I see. The Play Online button starts the old version. And the download link for the new version doesn’t work.
The reason the download link doesn’t work is that you left out the protocol (“https://”) in the link. I fixed that now.
The reason the Play Online button still can’t play the new game is that you’ve linked to a ZIP archive. If you link to a z5 file, it will work. Or to a ZIP archive hosted on if-archive.