What browser do you use? I have just tried on Firefox, Chrome and Edge, it works fine.
Ouch. I didn't know that itch has it's own launcher. I checked, it. Yep, download doesn't work. I tried to reupload file but it doesn't help, I noticed that some games have the same problem. My second game - Esothe is downloaded properly. I have no idea how to fix it.
I reccomend to download Venineth through browser at this moment. Sorry.