Hey, sorry about the late reply!
The file should be 6.75 Gb total.
My Google Drive says it's 7Gig, which I think is rounded up.
Anyway, I'm not sure what the issue is either.
What I can offer is trying to download the version from here:
https://joure.itch.io/stardropfirstcontact
I use 7Zip for my zipping needs (this is a regular zip, so it should work fine)
I'm wondering maybe your HDD could possibly be faulty? (I sure hope not)
I also unzipped the ZIP file I used to upload in a different folder (copy/pasted it) and that worked fine as well.
Anyway, try the file from the first contact version, it's the same experience just offered up at a different way.
Let me know if any of this was helpful!
And thank you for sharing,
I'll now download the file myself and see what happens on my end!
Sorry about the issue!!!