Well, I had no issues downloading from the website. But those aren't install executables at all, those are Ren'Py executables. So I have no clue at all why it's incompatible with the client.
I don't think this game is for me, anyway. I can't relate to the MC at all, and I'm finding it immersion-breaking. But that's just me; I'm sure it's not an issue for someone who can relate to the MC.