Please extract each zip-file into a separate folder.

In the end you should have a folder-structure like:

Papaya/
Papaya/VIS_COR/
Papaya/VIS/
Kiwi/
Kiwi/VIS/
Kiwi/NIR/
Avocado/
Avocado/VIS_COR/
Avocado/VIS/
Avocado/NIR/
annotations/
Kaki/
Kaki/VIS_COR/
Kaki/VIS/
Mango/
Mango/VIS_COR/
Mango/VIS/