I have this problem, too, more or less. I can unpack them, but as I test them for integrity and Assets, Models 1 and 2 and Media can't be opened. Could it be the browser with which I downloaded (Internet Explorer).
Here is a screenshot of them with the sizes:
![Untitled.png](./download/file.php?id=3215)
- Untitled.png (71.04 KiB) Viewed 1451 times