Ohhh, I see! Thank you for the screens! They've been very useful to understand the problem.
I searched info and found something. It seems you're downloading the game from the itch.io app, and it failed to download because I didn't label the game properly as a Windows compatible game. I have fixed that, please let me know if you can download it now!
(I actually just removed the Alpha version because I feel too embarrassed about it hahahahaha. I had forgotten about its existence, but this post reminded me).