Update from my side: via steam all works because there's no compression in the download, so: no problem! :)
Print screen:
Direct translation: An error occurred when loading the file.
It happens when I click to open the zip file, I use Ubuntu with Gnome that has it's own program to handle compressed files: https://wiki.gnome.org/Apps/FileRoller .
I added 7zip, tried it, and it worked, so the problem is not from the file itself but from some incompatibility with FileRoller... Difficult problem, it can be from the file, from itch.io's Buttler, from FileRoller or even from my laptop, although I checked for updates and all is up to date.
My suggestion: don't worry to much unless someone else complains! ;)