the download worked for me, maybe it was a temporal server issue, try it again. The game after unzip will start by double click on the electron.exe . Let me know if you had luck with a second time. This should be true for the other games you posted under too.
Viewing post in Lulu's sudden wedding night comments
Then i think it's an app issue for some reason, I try to download from browser and it worked there. Try that and if that work then surely the app have some problem and write a ticket about it to support, maybe they can figure it out and fix the issue so it will not happen in the future. If you get some kind of error, be sure to incloud a screenshot of it.