Hello there,
Maybe that's the download who failed at some point and the archive was corrupted. Do you have any kind of message?
Same problem here, but android file, it's just stop downloading, idk why, I checked my internet first, and I have more than enough space on my phone.
And also now I have a shadow file (sort of?) Chrome tells me I already have (filename) then I click on download button, but I don't have it (apk file). It's kinda weird tho.
Great game btw, waiting for fix.