Thanks for the tip about the app, I will try it.
For now my problem is solved so all is ok!
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! ;)
I downloaded the new version (I hope, started a couple of hours after your post) and have the same problem.
Don't know which limitations itch.io has but if you can't get around them maybe it's easier to split the file (it's what people normally do when working with FAT32, for example). It's strange that this only happens with Linux...
If you need help testing just let me know!